The #20 Big Blue will meet all of your large-capacity filtration needs, including high-flow applications.The polypropylene caps include a pressure-relief button on the inlet side to relieve pressure inside the housing when changing water filter cartridges.Durable construction Whole House housings extend the life of washing machines, water heaters, and other household appliances.Ideal for swimming pools, homes, farms, private wells, restaurants, spas, and trickle irrigation.1" inlet/outlet for high-flow and heavy-sediment capabilities with minimal pressure drop Leaking is prevented by the dynamically sealing O-Ring. The O-Ring should be replaced periodically to prevent leaks.Complete kit including Hanging Bracket with Hardware, Housing Wrench.