These tiny quick disconnects have a 1/4" barbed fitting which can be used with either 3/16", 1/4" or 5/16" line. The shrouded thumb latch makes for easy quick disconnect function. The temperature range is -40F to 180F, and they can handle a vacuum to 120 psi, so don't worry about gas leaks! The internal valve spring is 316 type stainless steel and the o-ring is food grade buna-n.