Name: Subsea M10 Self-Sealing Vent & Vacuum Plug
Brand: Blu-Sub
SKU: BS-SSC-SSVPL-BLK-10A1
Price: 65.95 CAD
Availability: InStock

Subsea M10 Self-Sealing Vent & Vacuum Plug

$65.95

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

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

Shipping calculated at checkout.

The Subsea M10 Self-Sealing Vent & Vacuum Plug is engineered to support both vacuum leak testing and long-term negative pressure retention inside subsea enclosures. Its self-sealing design ensures that a vacuum can be maintained even after the vacuum pump is disconnected, thanks to an internal valve and threaded lock cap system. This makes it particularly suitable for situations where a sealed vacuum state needs to persist after testing—such as preventing condensation, managing internal pressure balance during immersion, or monitoring slow pressure changes over time.

Unlike the M8 Enclosure Vent & Vacuum Plug, which is primarily intended for passive air venting and short-term vacuum leak testing, the M10 plug is designed with a copper plug and internal self-sealing mechanism that allows the system to stay under vacuum without requiring the pump to remain attached. While both products can be used for leak detection, only the M10 model retains the vacuum state autonomously, making it more appropriate for applications requiring stable internal negative pressure during storage, transit, or extended underwater deployment.

A manual vacuum pump is required to perform vacuum testing with this plug but is not included with the product. The M10 assembly includes the self-sealing bulkhead, a copper vacuum plug, and a lock cap, which must be installed securely before submersion to ensure a watertight seal. This product offers a robust and reusable solution for users who want to implement more rigorous pre-deployment sealing checks or maintain pressure differentials within their enclosure systems.

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Material	Vacuum Plug: Copper / Lock Cap & Body: Aluminum, Plastic
Weight	45 g
Color	Copper Plug, Black Lock Cap
Depth Rating	1,000 m / 3,280 ft
Dimensions	Refer to dimension drawing

DESCRIPTION

Subsea M10 Self-Sealing Vent & Vacuum Plug is designed to support both vacuum leak testing and the maintenance of internal negative pressure within a sealed subsea enclosure. Its self-sealing design features a copper vacuum plug and lock cap, which together enable the enclosure to retain vacuum pressure even after the vacuum pump is removed. This makes the M10 plug well-suited for use cases where negative internal pressure must be preserved during storage, transit, or deployment — helping prevent condensation, manage pressure differentials during immersion, and reduce the risk of flange detachment.

Unlike the M8 Enclosure Vent & Vacuum Plug, which provides a passive vent and temporary vacuum test capability but does not seal after the pump is disconnected, the M10 plug allows for ongoing pressure isolation. It includes an internal sealing mechanism and a lock cap that must be fully tightened before underwater use to ensure watertight integrity. While both options serve leak testing functions, only the M10 version can maintain negative pressure autonomously without requiring a connected hose or external valve.

A manual vacuum pump is required for both vacuum testing and initial pressure drawdown, but it is not included with this product. The complete M10 assembly consists of a self-sealing bulkhead, a copper vacuum plug, and a threaded lock cap. Once installed, it offers a compact, reusable, and secure method to manage internal enclosure pressure without needing to modify the plug or use adhesives.

Note: Vacuum testing only verifies airtightness and not pressure resistance. For pressure resistance, hydraulic testing is still required.

The Subsea M10 Self-Sealing Vent & Vacuum Plug and the Subsea M8 Vent & Vacuum Plug are both used for vacuum testing subsea enclosures, but serve distinct purposes based on deployment needs and pressure retention requirements.

M10 Self-Sealing Vacuum Plug
Designed for long-term vacuum retention, this plug features an internal valve that seals automatically once vacuum is established. A lock cap further ensures watertight integrity. Ideal for maintaining internal negative pressure during transport, storage, or extended subsea deployment.

M8 Vent & Vacuum Plug
A simpler alternative intended for short-term vacuum leak testing and passive venting. This plug does not retain vacuum once the hose is removed and is better suited for shallow-water or temporary use where long-term sealing is not required.

Key Differences

Vacuum Retention: M10 seals autonomously after pump removal; M8 requires hose connection to maintain vacuum.
Application: M10 is suited for long-term or deep-water use; M8 is intended for testing or short-term deployment.
Components: M10 includes a self-sealing valve and lock cap; M8 uses a simple threaded cap and hose fitting.
Port Size: M10 uses a larger M10 bulkhead; M8 uses a smaller M8 size fitting.

Subsea M8 Vent & Vacuum Plug

Compatible Subsea Enclosure Options

Sold Separately

The Subsea M10 Self-Sealing Vent & Vacuum Plug integrates into a wide range of Blu-Sub subsea enclosures using a standard M10 bulkhead port. It must be installed into a properly sized through-hole (Ø10.1 ± 0.1 mm) with sufficient panel thickness to ensure a watertight seal. Always ensure the O-ring contact surface is clean and flush prior to vacuum testing.

Subsea Watertight Enclosure Box
Compact aluminum housing rated to 300 m, pre-drilled with twenty M10 ports. Fully compatible with vacuum plug installation—no additional modification required.

Subsea Enclosure Acrylic Tube
Transparent cast acrylic tube rated to 250 m. Compatible with aluminum end-caps that can be drilled with an M10 port to install the vacuum plug for pressure integrity testing.

Subsea Enclosure Aluminum Tube
Rugged enclosure body rated to 1,000 m. Use with Blu-Sub aluminum end-caps featuring an M10 mounting hole for secure integration of the vacuum plug in high-pressure environments.

SHIPPING LIST

1 x Self-sealing Bulkhead
1 x Vacuum Plug
1 x Lock Cap
1 x Hose
(Manual vacuum pump not included)

TECHNICAL SPECIFICATIONS

Item	Subsea M10 Self-Sealing Vacuum Plug
Material	Vacuum Plug: Copper Lock Cap & Body: Aluminum, Plastic
Weight	45 g
Pressure Resistance Depth	1,000 m / 3,280 ft
Hose Size	Inner Diameter: 5 mm, Outer Diameter: 8 mm
O-ring Size	Ø12 × 1.5
O-ring Material	FKM75 Brown Fluorine Rubber

A dimension drawing is provided below. The left diagram shows the dimensions when installing the vacuum plug, while the right diagram illustrates the dimensions when installing the lock cap. Please note that the lock cap must be securely screwed on before the equipment is submerged to ensure waterproofing. Additionally, ensure that the O-ring is lubricated and inspect it for any impurities or scratches.

Mounting Hole Dimensions

Recommended Size	Vacuum Plug
Recommended Bulkhead Through Hole Size (A)	Ø10.1 ± 0.1
Hatch Cover Thickness (B)	13 mm
Surface Range (C)	20 mm

Vacuum Testing Guide

Install the self-sealing bulkhead into the enclosure end-cap.
Seal off the manual vacuum pump and confirm there are no air leaks in the pump body.
Connect one end of the hose to the manual vacuum pump and the other end to the copper plug.
Insert the copper plug into the bulkhead and press the pump several times until the plug holds in place under vacuum.
Continue pumping until the gauge reads approximately 15 inHg, then wait a few minutes.
Verify the reading does not drop more than 0.5 inHg, indicating a proper seal.
Remove the vacuum plug and securely screw on the lock cap before submersion.

Can it still be used if the contact surface of O-ring is accidentally scratched?
No, it cannot be used, as there is a risk of leakage.

Whether to apply grease to O-rings every time?
Yes, applying lubricating grease has several benefits: it helps remove dust and impurities from O-rings during application, and allows O-rings to adhere to the groove for easy assembly.

Do I need to tighten the lock cap very tightly?
No, you don't need to tighten it very tightly. Simply ensure the O-ring is fully inserted, then tighten until flush to achieve a good seal.

Why doesn't the vacuum plug have a latch?
When a vacuum is formed, the plug naturally stays in place and won't detach. A latch is unnecessary. Just hold the plug during initial pressing.

If I can't remove the plug after creating a vacuum inside the watertight enclosure, how do I release the air?
You can release the air by pressing downward on the internal step of the plug.

Should I use threadlocker on the nut?
Yes, threadlocker is recommended, as the lock cap is installed by rotation and may loosen over time.

Will water enter if I don't install the lock cap?
Yes, the lock cap must be installed to ensure waterproofing.

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) - Subsea M10 Self-Sealing Vacuum Plug