This quick coupler is made of stainless steel and is a non-valved type. Meaning, when disconnected, all gas escapes. Connection is 1/4 female NPT. Mates with #45516OX-SS and #45517OX-SS. Working pressure: 5,200 psi. Delivered Oxy-clean with Viton O-ring. Order #45515OX for brass version.