Simpure Whole House Water Filter Housing (Db10P), 10" X 4.5", Pressure Release PREMIUM QUALITY - Tested against NSF standards. The whole house water filter housing is made of reinforced polypropylene for strength and resistance to chemicals. Food grade material makes all filtered water is safe and healthy. UPGRADE DESIGN - Compared to other inline water filter housing for leakage complaints, SimPure's filter housing thicken and raises the threaded holes, making sure no water leaks from the mounting hole after long-term use. EASY INSTALLATION - The big filter housing blue comes with all tools required for installation, including a wrench, heavy-duty steel mounting bracket, 4 screws. The built-in red pressure-relief button for water pressure release, making it easier for filter replacement. 1" NPT PORT - The big water filter housing blue with 1" NPT thread. Per your water quality, you can choose the sediment filter, carbon water filter, etc for the DIY installation of the whole housing water filtration system. COMPATIBLE CARTRIDGES - The SimPure DB10 big housing blue fits for universal standard 4.5 ? x 10 ? filters cartridges, like SimPure CTO-F10B-5 (Search for B07QTGZYM9), MPP-F10B-5 (Search for B07QTGYQBC), Culligan R50-BBSA, CW25-BBS, CP5-BBS, DGD 5005, GAC-BB, R50-BB, Geekpure PP10-BB-5, ICEPURE 43215-4209, Aqua-pure KW811-4PACK, Geekpure, iSpring, Ronaqua, Hydronix, etc. Also fits for the whole house water filtration system. (Filter cartridges are sold separately) About O-ring: If you need an O-ring suitable for DB10P, please search for B09TR53SD1. Tips: Given the large size of this whole house water filter housing, please consider the space required to install and replace the filter element according to the size of the product, whether it is suitable for your installation area.