Combined Dust Plug & Cylinder Residual Pressure Test Plug. Fits BEST Fittings QC02 Socket as used on all current Daystate guns. Compatible with Foster 12FS, 12FSS and 12MS Straight Thru Quick Couplers. Essential to the keep the nasties out of your prized shooting tool, and quickly test your cylinder pressure to boot!

To read the residual cylinder pressure, install the plug into the QC02 or compatible 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.

Close the valve and bleed the system in the normal way prior to removing the test plug