The General Pump 520190 is an adaptor used to connect a pulse pump injectors to Series 47 and 50 pumps. Compatible with pump models 47 T, 47 TT, 47 TS, 47 HTS, 50 T, 50 TT, 50 TS, and 50 HTS. Features a 1/4" NPT-M connection port. A genuine OEM part.