The bypass valve of Pentair water softener 5600SXT is Noryl plastic; this can last longer than a stainless steel bypass. The Center distance between two valves is 2.125" and has 1" male threaded yokes. But 3/4" valve yoke is most commonly used for plumbing, and on request, the manufacturer can replace it with a 3/4" valve yoke. After applying the silicone lube provided to valve yokes, we have to connect them to water lines.