Fuel/Water Separator Spin-on with Open Port for Bowl Contains: Port Thread: M80 x 2.5 Integral Post Seal Fits: Mack, Volvo Engines, Trucks Replaces: Mack 21017305; Volvo 20879806 Thread: 1-14 O.D.: 4 1/4 (108.0) Length: 5 3/16 (131.8) I. Gskt.: [1] Included O. Ring: [1] Included