Best Fittings Quick Connect Test Plug

A quick and simple way to check your tank capacity and also prevent debris from ingressing into your air rifle, that may have gathered on your quick fill connector while not in use.

Compatible with Foster 12FS, 12FSS and 12MS Straight Thru Quick Snap Couplers.

To read the residual cylinder pressure, install the plug into the Best Fittings fill connector, close the bleed valve on the cylinder and slowly open the cylinder air control valve. The pressure inside the cylinder will be indicated on the cylinder or charging head gauge. Bleed the system after use.