A-4000-16P-P Complete Quick CouplerOne New Aftermarket Replacement Complete Quick Coupler Pioneer 4000 Series, 1 2" Body, Poppet Valve This complete quick coupler is a Pioneer style 4000 Series hydraulic quick disconnect coupling with a 1 2" body and poppet valve design. It connects hydraulic lines quickly and cleanly on tractors and other equipment, providing a double shut off connection that prevents fluid weeping and drips. The "P" suffix denotes a poppet valve, which creates a