Engine Model: Pilot 10-20 Engine Part Number: 16423 Pump Availability: Contact Westerbeke at help@westerbeke.com or www.westerbeke.com Sherwood Replacement Pump: N/A Impeller Kit: 09959K Minor Repair Kit: Major Repair Kit: 12221 Inlet Port: 1/2" NPT Outlet Port: 1/2" NP