Get convenient filtered water on demand from the OMNIFILTER-OB5-S-05 undersink filter system. The OB5 can be easily installed on any standard 3/4-inch water line and comes with a housing wrench for easier filter changes. The OB5 lets you choose a cartridge from any of Omnifilter s standard 2-1/2-inch by 10-inch filters so it is ideal for any water filtration job. The OmniFilter Whole House Filter System fits standard 3/4-inch MPT lines. 3/4-inch NPT inlet and outlet thread openings. Clear housing makes it easy to monitor filter performance. Easy to install on 3/4-inch water lines. Built-in pressure relief button makes filter changes fast and easy.