Detailed Description: 20 Inch x 4.5 Inch Big Blue Clear Whole House Filter Housing 1 Inch Ports W/ Pressure Relief One (1) New 20 inch x 4.5 inch Whole House Clear Filter Housing 1 inch NPTF in/out Brass Ports , Double O ring with pressure release button with additional pressure gauge hole with block cap fitting is included can be open and add pressure gauge in the future if required. Includes: 1 x 20 inch x 4.5 inch purple Clear Double Oring filter housing with pressure release button and 1/8 inch NPTF pressure gauge hole 1 x Bracket + 1 x Wrench +1/8″ NPT pipe thread Brass Allen plug with o ring (Parts are not assembled together) Specifications: Feed water pH range: 4.0 – 10.0Double O ring HousingNPTF in/out Port Sizes: 1 inchEasy screw off for quick filter changesAccepts standard 20 inch x 4.5 inch diameter water filter cartridgesClear Filter housing for easy maintenance, allows for visual inspection of filter cartridgeHeavy-duty constructionRated for pressures up to 90 PSI (6.20 bar)maximum operating temperature 125°F (52°C)Made from FDA grade polypropyleneHead/ Cap Color : BlackSump/ Housing Color : ClearPressure Release: YesPreferable feed water pressure range: 20 – 90 PSI to Get the best filtration results keep it less than 60 PSI.Maximum feed water TDS: 2000ppmFlow Rate 1 – 40* GPM for 1 inch Inlet / Outlet* Pressure drop will be determined based on feed water pressure, filter cartridge selection, fluid viscosity, filter life and conditions.