Description Sherwood G21 is a bronze, pulley‑driven engine cooling pump featuring a neoprene flexible impeller (kit 09959K), 1″ inlet and 1″ outlet ports, stainless steel shaft, mechanical seal, rear support bushing and ball‑bearing drive, commonly used on Pleasurecraft (PCM) Ford 302 and 351 V8 marine engines (OEM RA057007).