I have a well and a pump house. The well pumps into a 200 gallon equivalent pressure tank (30-50 psi),, which pumps into a 1000 gallon holding tank via a Robertson valve (pretty much a large version of what's in your toilet tank). The holding tank is at 1 bar (14.7 psi) and allows diffused gas to be released from the well water so only water is pumped to the house. What gas? Don't know, don't care. Chlorine injection: let's you sleep at night. The water from the holding tank is not pressurized (well, maybe, max 2psi) and is sent to the house via a Grundfos MQ3-45 booster pump. The booster pump was supposed to keep pressure between 45 and 65 psi, but no. Pressures of 85 to 90 psi seen at house: ruptured toilet feeds; fun, fun, fun 'til your daddy takes the t-bird away. Enter our hero: LFN45BM1-U 1" water reducing valve. The 1" LFN45BM1-U 1" water reducing valve has 1, 1" union valve. Which is confusing, but it also has two 1" FPT threaded connections on either end (MPT, FPT and NPT are all the same standard -- M == Male, F == Female, N == either or both). I chose to make the brass union coupler into a really snazzy Xmas ornament, which I don't have a picture of, but it's really fetching. Who says pumbing isn't exciting? To connect the pressure reducing valve, I used two 1" Male PVC connectors, which are screwed into the valve (copious amounts of Teflon tape; really torque these down as the NPT standard is designed for this); and glued to the existing PVC between the pump and the house (e.g. torque male PVC to valve, glue slip to existing PVC). I also had two 1" slip x 1/2" threaded FPT tees, with brass 1/2" MPT x 1/4" FPT reducer adapters so I can have a pressure gauge before the valve and after the valve for adjustment/fun purposes. See adjustment instructions included with valve, but it's basically: loosen lock nut, righty highty, lefty lowy. Sure, I could adjust the booster pump, but this is a black art and seldom practiced (existing internet sources talk about "adjusting pressure", but not "what pressure" -- low pressure, high pressure??). Besides, if, in the future I want to install some other kind of booster pump, I already have a watchdog to keep the toilets from exploding.