Our Cummins B Series Lower Water Inlet solves a common problem with diesel 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 these sizes:
This lower inlet has a horizontal outlet direction. This provides an easier lower radiator hose installation in many different vehicle chassis.
Made from laser cut 3/8″ Steel, our custom-fabricated inlet is surface-ground and pressure-tested prior to shipment to verify a leak-free install. Inlets 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.
Our inlet is compatible with any of the B-Series Cummins engines, including the 6BT and 4BT.
This Cummins B-Series inlet DOES NOT have a 1/2″ Female NPT fitting to accommodate a heater hose return line. Looking for an inlet WITH the side fitting? We’ve got you covered here. Inlet with side fitting is also included in our custom-made high mount kit here.