Furnished with an Anti-Drain-Back Valve Valve eliminates dry starts, prevents oil from draining back into crankcase during engine shutdown 20mm x 1.5 thread Interchangeable with Mallory 9-57810, Fram PH6607, Westerbeke 30220, and Yanmar 119305-35150, 119305-35151, 119660-35150, and 124450-35100