I have 2 3-way NevrLubes.....one on the inlet side (main drain and skimmer are separate lines, I used the 3-way to tie them together before entering the pump), and a 2nd 3-way for the returns (2 separate returns, I use the 3-way to split them from 1 pipe off the filter to 2 separate runs to the pool).
They work quite nicely. Very handy to be able to concentrate the inlet flow (when vacuuming, no need for the main drain), and the return side was installed so I could track down a plumbing leak (by turning off a return I could figure out which one was losing water). The return side valve isnt used as much as the inlet, but I feel its nice to have both of them anyway.
I also like how I never have to lube them, they cost a little more but are well worth it IMHO.
-Chris
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