Plastic quick disconnect with 3/8" barb which can be used with either 1/4", 5/16" or 3/8" line. The quick disconnect functionality is activated by a shrouded thumb latch on the female QD. 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 o-ring is food grade buna-n.
This is a non-valved QD. It does not have an internal shut-off.