Aimed at home brewers who use carbonation, this video explains how to change the rubbers on the S30 Valve to ensure a good tight seal.
The S30 Valve is a very simple injection and pressure release valve, engineered for use with a pressure container for dispensing beer and lightly carbonated drinks.

Due to their simple nature, S30 valves rarely go wrong, one way to get the best results is to keep the rubber seals in good condition.