Water Pump Impeller Service Kit – Fits Mercury Marine & Tohatsu/Nissan 25-40 HP (Replaces 47-16154-1, 3R0-65021-0, 345-65021-0) 25-50HP and GLM 12744

and GLM 12744

so it's best to replace it if you notice any structural issues

it is good practice to inspect your thermostat annually and consider replacement every 2-3 years

Height: 23

This is a composite gasket

Water Pump Impeller Service Kit – Fits Mercury Marine & Tohatsu/Nissan 25-40 HP (Replaces 47-16154-1, 3R0-65021-0, 345-65021-0) 25-50HP and GLM 12744Product Details This Water Pump Impeller Service Kit is engineered for Mercury Marine 25 30 HP 4 Stroke Sea Pro Lightning models (2005 and newer) and a wide range of Tohatsu Nissan 25 40 HP 2 Stroke and 25 30 HP 4 Stroke outboard engines from 19962005. It provides a reliable solution for maintaining your engine's cooling system. This kit serves as a direct replacement for Mercury part 47 16154 1, Tohatsu Nissan parts 345 65021 0 and 3R0 65021 0, and