These quick disconnects feature 1/4″ barbed fittings which can be used with either 3/16″, 1/4″ or 5/16″ line. The quick disconnect functionality is activated by a shrouded thumb latch. The temperature range is -40F to 180F. They can handle a vacuum to 120 psi – so you need not worry about them leaking gas. The internal valve spring is 316 type stainless steel and the o-ring is food grade buna-n.