Atlas Filtri DP BIG Clear Water Filter Housing 20" INSTALLATION & USE RA1800911 - DP BIG 20The 'BIG BLUE' 20" Filter Housing is designed to house any of the 20" BIG SX filter cartridges. Suitable for a wide range of heavy-duty water filtration solutions.Brand new range of housings designed to fit to "BIG" filter cartridges with outer diameter (OD) from 4" to 4.50", inner diameter (ID) 1.10", height at 10" and 20" with standard SX (DOE) configuration.With female IN/OUT connections at 1" or 1 1/2" with BSP plastic threads DP BIG housings are suitable for every domestic Point-of-Entry (POE) or every industrial application when heavy duty performance is a must.The transparent bowl allows you to see when your filter needs replacing.Plastic BSP Threads. *INCLUDES THE ATLAS DP BIG SPANNER - FOR OPENING AND CLOSING THE FILTER HOUSING* CONSTRUCTION Non-toxic materials, suitable for drinking waterHead: reinforced polypropyleneClear Bowl: SANO-Ring: EPDMBreather-valve: body polypr