A sample from the products for the Water Pump (yp20g) include: Casing, Gasket, Casing Cover, O-ring, Ybs67-10 Washer, Spring.
The most reasonably priced component used on the Yp20g Yp20ga Yp30g Yp30ga Wa Water Pump (yp20g) is the Washer(6a1).
The Water Pump (yp20g) is made up of components including this Base which is the most expensive.