Filter Housing, 20" Big Blue (Pentek) 150233 with 1" ports Big Blueﾮ Filter Housings offer the versatility to meet all of your large-capacity filtration needs, including high-flow and heavy-sediment applications. The extra large housing allows for greater cartridge capacity, reducing the number of vessels required for high flow-rate applications. Sumps are constructed of durable reinforced polypropylene and are available in both 10" and 20" lengths. The high-flow polypropylene (HFPP) has 3/4" NPT inlet and outlet ports. The 1ﾼ" internal port allows a greater volume of liquid to pass through the HFPP cap more rapidly. Big Blueﾮ housings are compatible with a broad range of chemicals and are available with or without a pressure relief button. They accept a wide variety of 4ﾽ" diameter cartridges.