The Importance of O-Rings on SCUBA Tanks

The Importance of O-Rings on SCUBA Tanks
To enjoy the excitement of SCUBA diving, divers rely on gear that allows them to breathe compressed gas while underwater. O-rings are vital components of SCUBA gear, since they facilitate the movement of gases between various components.

Purpose

An o-ring forms a seal linking two components to allow the flow of gas between them. O-rings are found in three locations on a SCUBA tank: the tank neck, inside the pillar valve and the regulator seat on the tank valve (or pillar valve).

Sizes

Scuba o-rings range in size with the smallest (11/16-inch outside diameter) found inside the cylinder valve bonnet nut and the largest sealing the tank neck (1 1/4 inches outside diameter).

Materials

Most o-rings used on air cylinders are made from synthetic rubber (nitrile). For oxygen-rich cylinders, fluoroelastomer (viton) o-rings are used to reduce the risk of fire.

Tank Neck O-Ring

The tank neck o-ring seats between the pillar valve and the cylinder opening to create a seal.

Pillar Valve O-Ring

The pillar valve o-ring is located inside the valve that controls the flow of gas out of the cylinder.

Regulator Seat O-Ring

This o-ring seats between the regulator first stage and the tank valve to allow gas flow out of the cylinder. The DIN regulator screws into the tank valve to trap the o-ring securely.

Keep Me Informed

Weekly newsletters, announcements and offers from Trails.com to your inbox.

Sign me up!

We HATE spam and promise to keep your email addresses safe and secure.