This threaded dust cap for DIN Regulators is machined from Delrin to reproduce the sealing surface of a DIN valve. When screwed to the DIN fitting on the regulator, debris and moisture is prevented from entering the DIN orifice of the regulator as well as protecting the threads.

Best practice when rinsing regulators in fresh water is to do so while the regulator is pressurized. This cap will make a tight seal with the DIN o-ring in the regulator first stage DIN inlet, such that the cap is suitable for sealing the first stage inlet when you wish to gently spray fresh water on the regulator to rinse. Regardless, avoid submerging an entire unpressurized regulator including the second stages in a dunk tank or rinse bucket as in some circumstances that can allow water to enter through the second stages and if not immediately blown out the moisture can travel up the hoses in to the first stage.