This listing is for 1 Brand NEW Filter assembly. These filter air entering unit when used as a filter and reduces sound when used as a muffler on exhaust side. Fitting: 1/4" NPT Threads. These fit on ALL rocking piston and rotary vane pumps and compressors with a 1/4" NPT port. Typically made by Thomas, Gast, GSE, Kas co Teich-Aire, Fasco, Brookwood, Air max, Easy Pro, Atlantic Water, and many more. SRC25, SRC50, SRC75, KM-60, KM-120, MPC-6016, MPC-120, 2660, 72R637, 71R, 74R, TPD100, 2685PE40, 2660CE37, RP50. This listing is for 1 Brand NEW Filter assembly. These filter air entering unit when used as a filter and reduces sound when used as a muffler on exhaust side. Can be used as either intake pre filter or exhaust muffler. Fitting: 1/4" NPT Threads. Listing is for the entire filter assembly only. No other parts or components are included. These fit on ALL rocking piston and rotary vane pumps and compressors made by Thomas, Gast, GSE, Kas co Teich-Aire, Fasco, Brookwood, Air max, Easy Pro, Atlantic Water, and many more.