COUPLER DUST COVER/PRESSURE PLUG
Compatible with Foster 12FS, 12FSS and 12MS Straight Thru Quick Snap Couplers. Essential to keep the nasties out of your prized shooting tool, and quickly test your residual cylinder pressure by blanking the system.
To read the residual cylinder pressure, install the plug into the 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. Bleed the system after use.
High-Quality Stainless Steel, made in the UK.