Pentek 20-BB

http://www.waterfilters.net/20-BB-1-Wholehouse-Water-Filter-System.html
The Pentek 20-BB is a large capacity whole house water filter housing for high flow applications. The #20 heavy-duty whole house water filter can be used for a variety of applications. The #20 Big Blue features a pressure release button on the cap. If installed before appliances with a sediment filter, the #20 Big Blue water filter housings extend the life of washing machines, water heaters, and other household appliances by reducing sediment before it reaches the appliances. The 20-BB is ideal for homes, farms, private wells, restaurants, swimming pools, spas, and trickle irrigation. Leaking and clogging is prevented by the dynamically sealing O-ring.