Long quick coupler for filling PCP air guns (air guns) Brocock, Daystate, Crosman, GunPower (AirForce air gun). Thread 1/8" BSP. This is a longer version standard quick couplers, which is suitable for filling air guns that have a recessed filling pin and the classic quick coupler is difficult to handle. The internal dimensions for the pin and thread for screwing in are the same as u standard quick couplers.