4 Screw Mount With Left Side Fill. 46 Cu. In. Made Of High Density Polyethylene With Uv Additive. Includes O-Ring & Fill Cap With Screen. Replaces Volvo Penta # 3858077. RES550 Is Used On API #?s PT406N-2, PT408N, PT506N-2, PT507N-2 This Will Not Fit On The Teleflex Type Pump. Arco# M533