Check the listing for details. 21-862271A1 Mercury Mercruiser Alpha 1 Marine Check Valve Kit NEW. Condition: New. Listed at 198.45 USD. The 21-862271A1 Mercury Mercruiser Alpha 1 Marine Check Valve Kit is a new product manufactured by Quicksilver in the United States. This kit includes a check valve designed specifically for Mercury Mercruiser Alpha 1 marine engines, ensuring proper water flow and control for optimal engine performance. With the Quicksilver brand known for quality and reliability in boat parts, this check valve kit is a trusted component for maintaining and upgrading your marine sterndrive system. OURS IS BRAND NEW UNOPENEDThe 21-862271A1 Mercury Mercruiser Alpha 1 Marine Check Valve Kit is a new product manufactured by Quicksilver in the United States. This kit includes a check valve designed specifically for Mercury Mercruiser Alpha 1 marine engines, ensuring proper water flow and control for optimal engine performance. With the Quicksilver brand known for quality and reliability in boat parts, this check valve kit is a trusted component for maintaining and upgrading your marine sterndrive system. OURS IS BRAND NEW UNOPENED