THIS ONAN OIL PUMP KIT IS THE MOST IMPORTANT GASKET IN YOUR ENGINE FITS MOST ALL ONAN 2 CYL. GAS ENGINES B,P,CCK,NHC,T260 AND COMES WITH THE OIL PUMP MOUNTING GASKET  YOU CAN NO LONGER GET NEW OIL PUMPS SO WE THOUGHT WE SHOULD OFFER THIS KIT.WHEN YOU SET YOUR PUMP UP YOU SHOULD HAVE AROUND 60-75 LBS AND SET YOUR BY PASS AT 25-30 FOR LONG LIFE.