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 on where you install these connectors into your system, but everything plugged in after those connectors will be detachable.
This model is female/male one part piece where you will connect the HTH-050 QUICK CONNECTORS OR any FLASHBACK ARRESTORS on the female side and a HOSE on the male side QCH( quick connector to hose) to ensure its installation 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.