Standard DIN O-rings are used on the male DIN fitting of many brands of first-stage regulators that screws into and seals to the female DIN fitting on the cylinder valve.
Used for Standard DIN Regulator Valve Size 1/2 ID x 3/32 OD x 11/16 CS 70~90 Shore A Hardness Color Black
Buna Nitrile rubber is considered the standard for most general applications. Excellent resistance to petroleum-based lubricants, hydraulic oils, gasoline, fuels, and L.P. gases. Temperature range -58 F to 248 F with intermittent service to 600 F.
