8.5mm brass tail to suit the brass quick release couplings
They have chemical resistant seals
High Quality heavy duty brass hose couplings
Spring loaded quick release .
Allows you to have one hose and couple quickly with other tools with the same fittings fitted.
They have stainless spring loaded shut off valves internally.
Unlike cheap air couplers these are quality brass housings so will not corrode and are designed for up to 800psi.
These are heavy duty