Vu-Flow Replacement Filter Elements - waterfilters
The pipe size number is embossed on the side of the filter body (top part of the filter) next to the "In" and "Out" arrows. Another way to determine the pipe size is to measure the length of the filter screen to determine the filter size: 5-1/8" Filter Screen Length = 3/4" or 1" Pipe Size 8-1/8" Filter Screen Length = 1-1/2" Pipe Size