Name: Subsea Enclosure Acrylic Tube
Brand: Blu-Sub
SKU: BS-SSC-ENCLT-ACR-A1A1
Price: 76.95 CAD
Availability: InStock

$76.95

5 Units Available for Quick Ship - Ships in 1-2 Business Days

Additional Units Made to Order - Ships in 2-4 Weeks

HS 3926.90 (CN)

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The Subsea Enclosure Acrylic Tube is a transparent, pressure-rated housing body designed for use in shallow to mid-depth underwater systems. Made from cast acrylic, it offers a durable structure ideal for visual inspection, sensor integration, and compact subsea assemblies. This versatile design also functions as an underwater pressure housing and forms the transparent body of an engineered pressure vessel (PV) when combined with compatible Blu-Sub flanges and end-caps.

This tube is fully compatible with the Subsea Aluminum Flange, which is used in combination with the Subsea Aluminum End-Cap to create a reliable waterproof seal using dual O-rings and mechanical compression. Together, they form a precision-machined pressure vessel (PV) assembly capable of maintaining watertight integrity in moderate subsea environments.

For builds requiring internal visibility, the tube can also be sealed using the Subsea Acrylic End-Cap, which requires the Subsea Aluminum Flange for installation. It provides a cost-effective, transparent end-cap option for shallow-water applications, with lower depth ratings depending on diameter.

For 115 mm systems, additional integrated flange/end-cap options include the Subsea Polymer Flange & End-Cap 115mm, the Subsea Optical Dome Flange & End-Cap 115mm, and the Subsea Optical Glass Flange & End-Cap 115mm, depending on optical and depth requirements.

The tube does not include a mechanical locking feature by design, as it is securely retained through flange compression, external water pressure, and optional vacuum retention using the Subsea M10 Self-Sealing Vent & Vacuum Plug. In typical operation, hydrostatic pressure increases sealing force, maintaining enclosure integrity. Applying a slight vacuum further increases holding force and provides an added level of security prior to deployment.

For compatibility with third-party systems or assistance selecting the right configuration for your underwater pressure housing or pressure vessel (PV) design, please contact us.

Subsea Enclosure Builder - Promo Section (Basic)

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Material	Clear acrylic, precision-machined ends with chamfered edges
Weight	Varies by size; see technical table
Color	Transparent
Depth Rating	20 m – 250 m / 66 ft – 820 ft (varies by size and length)
Dimensions	Refer to dimension drawing

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Description

The Subsea Enclosure Acrylic Tube is machined from cast PMMA (acrylic), offering strong optical clarity and excellent mechanical performance for underwater use. Its precision design enables use as an underwater pressure housing or part of an engineered pressure vessel (PV) system. The inner and outer diameters are precisely controlled to ensure a consistent O-ring seal when used with Blu-Sub flanges and end caps.

The outer diameter is machined flat at both ends to allow full-surface contact with the flange’s O-ring interface, improving sealing integrity. The inner diameter is slightly undercut at each end to accommodate O-ring compression and avoid radial interference when inserting flanges. This dual-end machining approach supports repeatable watertight performance under shallow to mid-depth conditions, ideal for small ROV assemblies and custom pressure vessel (PV) configurations.

The acrylic tube is compatible with multiple Blu-Sub sealing systems, depending on whether you need maximum depth rating, internal visibility, or a dedicated optical window for imaging payloads. Most builds use the Subsea Aluminum Flange paired with either the Subsea Aluminum End-Cap for high depth-rated enclosures, or the Subsea Acrylic End-Cap for cost-effective, transparent shallow-water builds where internal visibility is required.

For 115 mm tube systems, additional integrated flange/end-cap options are available, including the Subsea Polymer Flange & End-Cap 115mm for general-purpose shallow-water use, the Subsea Optical Dome Flange & End-Cap 115mm for wide-angle camera systems (requires the Subsea Aluminum Flange), and the Subsea Optical Glass Flange & End-Cap 115mm for precision flat-window imaging and sensor payloads.

When installing the Subsea Aluminum Flange or any other flange/end-cap assembly, be sure to thoroughly lubricate all flange O-rings using O-Ring Lubricant – MOLYKOTE® 111 Compound. Proper lubrication ensures smooth installation and prevents O-ring or surface damage, maintaining reliable sealing performance over repeated assembly cycles.

Flange & End-Cap Options

Sold Separately

Subsea Aluminum End-Cap
Provides a rugged sealing interface for the acrylic tube, using dual O-rings and mechanical compression. The Subsea Aluminum Flange is required to mount the Aluminum End-Cap and achieve a secure, watertight seal. We offer several pre-configured hole patterns for common setups, making integration with penetrators and connectors easy. Depth Rating: Up to 1,000 m / 3,281 ft.

Subsea Acrylic End-Cap
A cost-effective, transparent end-cap option for applications where internal visibility is required. Used with the Subsea Aluminum Flange to create a watertight seal. Thru-hole only design with lower depth ratings depending on diameter (up to 300 m / 984 ft).

Subsea Polymer Flange & End-Cap 115mm
An economical option for general-purpose use. Only available for 115 mm tube systems. Depth Rating: Up to 30 m / 98 ft.

Subsea Optical Dome End-Cap
Provides a wide-angle acrylic viewing dome for underwater vision systems requiring minimal distortion. Only available for 115 mm tube systems and requires the Subsea Aluminum Flange for installation. Depth Rating: Up to 1,000 m / 3,281 ft.

Subsea Optical Glass Flange & End-Cap 115mm
Features a precision optical window for imaging and sensor payloads. Only available for 115 mm tube systems. Depth Rating: Up to 300 m / 984 ft.

Alternative Blu-Sub Enclosure Options

Sold Separately

Blu-Sub Enclosure Aluminum Tube
Only available in 115 mm diameter, this rugged aluminum tube is designed for deep-sea use up to 1,000 m / 3,281 ft. It features long-life corrosion-resistant construction, an internal mounting rail system, and a bolt-locking flange design for secure sealing in high-pressure environments.

Blu-Sub Watertight Enclosure Box
Rated to 300 m / 984 ft, this compact aluminum housing is ideal for electronics that require heat dissipation through a direct thermal path. It includes pre-drilled M10 holes for cable penetrators and structural mounting, and is built for durability in subsea deployments where space and thermal management are key considerations.

Compatible With: Blu-Sub Subsea Acrylic Tube Clamp

Sold Separately

For secure mounting of your acrylic housing, the Subsea Acrylic Tube Clamp Set offers a reliable solution. Specifically designed for use with Blu-Sub Acrylic Tubes, these anodized aluminum clamps are available for 85 mm, 115 mm, and 165 mm diameters. Each clamp features a split-ring design with multiple M5 mounting holes and includes soft anti-slip pads to prevent rotation and slippage during deployment. Ideal for attaching enclosures to trays, plates, or frame structures.

Blu-Sub Subsea Acrylic Tube Clamp

Enclosure Interior Fitting Options

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Electronic Tray Set for Enclosure Tube
Provides a modular mounting system for internal electronics, batteries, and PCBs within Blu-Sub enclosures. Available for 85 mm, 115 mm, and 165 mm tubes, the tray includes base mounts, shelf supports, and mounting hardware. It is fully compatible with both acrylic and aluminum tube housings, allowing for structured and secure component layout.

Insulated PCB Board Shelf for Enclosure Tube
For simplified circuit mounting and layout planning, this shelf is designed to fit directly into the tray set using single-point or double-point shelf supports. Made from green, double-sided electrically insulated PCB material, it includes pre-marked point holes to assist with component drilling, pass-throughs, and cable routing.

Enclosure Interior Fitting Options

Optional Vent & Vacuum Control Solutions

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Blu-Sub offers two compatible solutions for managing pressure equalization, enclosure servicing, and vacuum leak testing. Each option supports different operational needs and levels of sealing performance:

Subsea M10 Self-Sealing Vent & Vacuum Plug
An advanced self-sealing port that allows both vacuum leak testing and retention of negative internal pressure after hose removal. The internal valve and lock cap maintain vacuum post-disconnection, making it ideal for preventing condensation or stabilizing pressure. Includes bulkhead, copper vacuum plug, and lock cap. Rated to 1,000 m / 3,280 ft. Applying negative pressure can also help hold the enclosure closed, improving seal performance during storage or deployment.

Subsea M8 Vent & Vacuum Plug
A compact two-part system for manual venting and temporary vacuum testing. Vacuum must be resealed manually by inserting the plug after test. Best for quick leak checks or venting during servicing. Rated to 1,000 m / 3,280 ft. Brief vacuum pressurization can assist with pulling flanges tight or holding enclosure lids shut prior to fastener installation.

SHIPPING LIST

1 x Enclosure Acrylic Tube

Technical Specifications

Item	Material	Depth Rating	Weight
85 Acrylic Tube /200 Length	Clear Acrylic	250 meters / 820 ft	316g
85 Acrylic Tube /250 Length	Clear Acrylic	200 meters / 656 ft	400g
85 Acrylic Tube /300 Length	Clear Acrylic	150 meters / 492 ft	485g
85 Acrylic Tube /350 Length	Clear Acrylic	140 meters / 459 ft	570g
85 Acrylic Tube /400 Length	Clear Acrylic	130 meters / 427 ft	651g
115 Acrylic Tube /200 Length	Clear Acrylic	180 meters / 591 ft	460g
115 Acrylic Tube /250 Length	Clear Acrylic	150 meters / 492 ft	578g
115 Acrylic Tube /300 Length	Clear Acrylic	130 meters / 427 ft	737g
115 Acrylic Tube /350 Length	Clear Acrylic	100 meters / 328 ft	831g
115 Acrylic Tube /400 Length	Clear Acrylic	90 meters / 295 ft	962g
165 Acrylic Tube /200 Length	Clear Acrylic	100 meters / 328 ft	693g
165 Acrylic Tube /300 Length	Clear Acrylic	80 meters / 262 ft	1092g
165 Acrylic Tube /400 Length	Clear Acrylic	50 meters / 164 ft	1495g
165 Acrylic Tube /500 Length	Clear Acrylic	20 meters / 66 ft	1900g

* Pressure-resistant depth retains a margin of safety, but should be less than 300 hours in the vicinity of the rated depth. For long-term use at the rated depth, it is advisable to use Blu-Sub’s enclosure aluminum tubes. The rated depth data refers to the pressure-resistant depth without vacuum evacuation.
** The rated pressure depth of the 165×500 specification is estimated. Due to the limited size of the pressure test equipment, this specification has not been tested.

SPECIAL NOTE: Acrylic products should not come into contact with alcohol, do not touch any kind of alcohol or alcohol derivatives or the acrylic tube will break and fail! Do not clean any acrylic with alcohol either! Use only water or acrylic safe cleaners. Alcohol, solvents and harsh cleaners will crack and damage the material! Most threadlockers are chemically incompatible with plastics and will also damage acrylic!

Item	Inner Diameter (A)	Outer Diameter (B)	Length (C)	Piston Hole Depth (D)
85 Enclosure Acrylic Tube	73 mm	85 mm	Total Length ±1 mm	28.5 mm
115 Enclosure Acrylic Tube	102 mm	115 mm	Total Length ±1 mm	29 mm
165 Enclosure Acrylic Tube	151 mm	165 mm	Total Length ±1 mm	29.5 mm

Why should it be used for less than 300 hours at rated depth?
The 300-hour guideline applies when operating at the **maximum rated depth** for the acrylic tube, as specified in the specification table above. At that depth, prolonged exposure may lead to material creep and increased risk of leakage. However, if operated at shallower depths or used as an underwater pressure housing within its rated limits, the tube's lifespan is significantly extended and long-term use is generally not an issue.

Why are there precision-machined steps at both ends of the tube?
Standard acrylic tubes often lack the roundness and precision necessary for reliable sealing. Precision machining ensures a smooth, round surface for proper O-ring compression and consistent sealing performance in engineered pressure vessel (PV) assemblies.

Can it still be used if the O-ring contact surface is scratched?
No. Any damage to the O-ring contact surface may compromise sealing and create a risk of leakage. It should not be used if scratched, especially in applications where it serves as part of a sealed pressure vessel (PV) system.

Can custom lengths be requested?
Yes. Custom lengths can be produced for an additional fee, though longer lengths may reduce pressure resistance. Lead times may vary depending on the order and whether the tube is configured for use as an engineered pressure vessel or standard subsea enclosure.

Are other internal and external diameter sizes available?
Yes. Additional sizes are in active development and production for a range of underwater pressure housing and subsea enclosure applications. Please inquire for availability or custom requests.

Are they compatible with Blu-Sub Aluminum Enclosure Tubes?
Yes. These tubes are compatible with Blu-Sub Aluminum Enclosure Tubes and can be directly interchanged, allowing flexible integration across pressure vessel (PV) configurations. Note: internal volume and dimensions may differ slightly.

Why not use PC (polycarbonate) material instead of acrylic?
Under specific conditions, tested acrylic tubes outperformed polycarbonate in sealing and deformation resistance, making them better suited for engineered pressure vessel and submersible enclosure applications.

Why are there no holes on the sides to mechanically lock the flange?
The Blu-Sub Acrylic Enclosure Tube does not include side locking holes by design. Sealing is achieved via flange friction, external water pressure, and optional vacuum retention using the Blu-Sub Vacuum Plug Kit. This design consistently maintains sealing integrity in normal use. When assembled, the enclosure performs as an underwater pressure housing, remaining sealed under external pressure. Applying a slight vacuum significantly increases holding force. If a lockable option is required, the Blu-Sub Aluminum Enclosure Tube includes mechanical locking features for enhanced pressure vessel configurations.

3D Model Viewer

Note: The 3D model shown above is for reference purposes only. It may include components, accessories, or alternate sizes not included with the product. For simplicity, only a single representative size is typically displayed when multiple versions exist. Please refer to the product Shipping Guide for detailed information on included contents and size-specific differences.

Download 3D Model (STEP) - Blu-Sub 85 Acrylic Tube 200 Length

Download 3D Model (STEP) - Blu-Sub 85 Acrylic Tube 250 Length

Download 3D Model (STEP) - Blu-Sub 85 Acrylic Tube 300 Length

Download 3D Model (STEP) - Blu-Sub 85 Acrylic Tube 350 Length

Download 3D Model (STEP) - Blu-Sub 85 Acrylic Tube 400 Length

Download 3D Model (STEP) - Blu-Sub 115 Acrylic Tube 200 Length

Download 3D Model (STEP) - Blu-Sub 115 Acrylic Tube 250 Length

Download 3D Model (STEP) - Blu-Sub 115 Acrylic Tube 300 Length

Download 3D Model (STEP) - Blu-Sub 115 Acrylic Tube 350 Length

Download 3D Model (STEP) - Blu-Sub 115 Acrylic Tube 400 Length

Download 3D Model (STEP) - Blu-Sub 165 Acrylic Tube 200 Length

Download 3D Model (STEP) - Blu-Sub 165 Acrylic Tube 300 Length