Pressure-Relief Plugs | McMaster-Carr

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241 Products

Breather Vents

Protect against excess vacuum and pressure in cylinders, gear boxes, enclosures, manifolds, and tanks.

Corrosion-Resistant Breather Vents

These breather vents withstand corrosion in damp environments.

Self-Draining Breather Vents

Minimize moisture buildup in enclosures. Also known as drain plugs, these breather vents have a small outlet that allows condensation to drain.

Weather-Resistant Breather Vents

Shield outdoor pipe and tank openings from the environment. Also known as vent caps, these breather vents have screens to allow air flow while blocking debris.

Washdown Weather-Resistant Breather Vents

These breather vents are rated NEMA 6 to withstand periodic submersion in water.

Lockable Breather Vents with Cap

Secure access to vented openings in pipe and tanks—the cap can be locked to prevent tampering.

Moisture-Eliminating Breather Vents

Keep moisture, dirt, and debris from entering your oil reservoirs.

Breather Vents with Cap

Add a filling port to your hydraulic tank while protecting against excess pressure and vacuum.

Pressure and Vacuum Monitoring and Control

Compact Pressure-Relief Valves

Less than a quarter of the height of standard pressure-relief valves, these are often installed on tanks in low-clearance areas.

Heat-Activated Threaded Pressure-Relief Discs

Also known as fusible plugs, these discs have a metal core that melts at a set temperature to exhaust discharge directly.

Expansion Plugs with Bypass

Use the bypass tube on these plugs to add air, water, and other fluid to your pipeline or to relieve pressure while testing.

Deep-Reach Hex Nut Expansion Plugs with Bypass

Use the bypass tube to add air, water, and fluid or relieve back pressure.

Air-Inflatable Plugs with Bypass

Use the bypass tube on these plugs to add air, water, and other fluid to your pipeline or to relieve back pressure while testing.

Safety-Vent Grease Fittings

To protect equipment from damage, the slit in the threads of these fittings acts like a breather vent, releasing any excess pressure and grease.

Drum Plugs

Install these plugs into drum holes using a drum-plug wrench.

Wire, Cable, and Hose Routing & Protecting

Vented Plastic Submersible Cord Grips

Vent air from your enclosure to equalize pressure and stop condensation from forming inside while securing cords in wet environments. These polyamide grips are lightweight and resist rusting.

Vented Brass Submersible Cord Grips

Secure cable installed through enclosures in wet environments while venting air to protect electronics from condensation.

Hazardous Location Drain Vents

Safe for use around hazardous gasses and dust, these vents maintain steady pressure and prevent moisture buildup from temperature changes inside enclosures.