Our Cummins B Series Lower Water Inlet solves a common problem with Cummins swaps. How to make the lower water connection with the proper size hose and location? Unlike the OEM water inlet part number 3941929 our Cummins B Series Lower Water Inlet is available in the common 1.5″ 1.75″ 2″ as well as the 2.375″ lower radiator hose sizes. In addition our Cummins B-Series has an 1/2″ Female NPT fitting to accommodate a 5/8″ or 3/4″ heater hose or coolant return line. This lower inlet has a horizontal outlet direction as well as a rear facing female NPT fitting. This provides an easier lower radiator hose installation in many different vehicle chassis.
Made from laser cut 3/8″ Steel this part is surface ground and pressure tested prior to shipment to verify a leak free install. It can be directly mounted to your 6BT or 4BT block with the OEM sealing O-Ring or installed with our die cut gasket. In addition this Cummins B Series Lower water inlet can be used along with the OEM Cummins Mid/High mount accessory mount part numbers 3930822 or 3930888. This Inlet can be used on any of the B Series Cummins engines including the 6BT and 4BT