These quick connectors allow you to attach and detach a part of your heating system quickly to keep the flexibility to transfer it to another.
It all depends where you install them into your system, but everything plugged in after these connectors will be detachable.
This model is a male /male one part piece where you will connect an OXY ACETYLENE HOSE on one side and the QCH-050 QUICK CONNECTORS or the QCH-100 FLASHBACK ARRESTORS on the other side for a HTH ( hose to hose) final connection into a system.
When sold, it comes as a 2-piece set, one for the Oxygen, and one for the Acetylene to ensure the fast connection and disconnection from one system to another.
Please note that these references are delivered with their own HOSE CLAMPS set.