Wilkins: 2 1/2″ – 4″ – Second Check Seat Retainer for a 350A / 350 / 450 Double Check Assembly {OR} 375A/ 475/ 375 Reduced Pressure Zone Assembly
• 2 1/2″ – 4″ check seat retainer for models 350A / 375A
• 4″ check seat retainer for models 350 / 375 / 450 / 475
(Two are required for one backflow assembly)
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