Watts LFN45B Series 1" Lead-Free Cast Copper Silicon Alloy Water Pressure Reducing Valve, NPT Thread Union Inlet x NPT Female Outlet, Elastomer Disc, Adjustable Pressure 25 to 75 psi, Maximum 400 psi

I purchased the 1” Watts LFN45BM1-U to replace my 30 year old Watts N35B. It is the exact same length. This came with two O rings, and a flange. The flange has 1” female threads. A second flange can be purchased depending on the configuration needed. The unit also has 1” female threads on both the inlet and outlet. My original installation used a flange on the inlet and threads on the outlet. The price was right and Amazon delivered it the next morning!Installation tips: If your replacing an older PRV where you have a flange on one end and threaded on the other end, you may have difficulty getting enough clearance to unthread, remove and replace the PRV. Mine was installed on a very short section of 1” copper pipe. It came up through my garage floor through a shutoff and the PRV and then went to an elbow. To get enough room I used a board and a handcut wedge and hammer to carefully prop up the pipe at the elbow to gain enough room. I screwed one end on and then carefully insert one of the O rings before tightening up the flange. For some reason Teflon tape failed to seal twice, I ended up using pipe dope.The symptom that lead to the replacement was a sudden spike in pressure when turning on a tap after having heated hot water. I reasoned that I needed an expansion tank, as per code for a closed system. My house built in 1994 never had one. After installing the expansion tank properly I was getting an extended amount of high pressure. When I installed the expansion tank I measured the water pressure to be 60 psi. Purchased a new maximum reading pressure gauge for my hose bib and discovered the pressure would slowly creep up to 82 psi or 94 psi if the expansion tank valve was closed. Isolating the hot water heater also showed sharp increases in pressure. With a faucet running the old PRV would maintain around 50 psi but would slowly build by its own (pressure creep). The new valve is supposed to be set at the factory for 50 psi, but seems to actually be providing 55 psi. Worked great, didn’t bother to change it.If this new PRV fails early I will update my review

I bought this to replace a 20-year-old N35B in my new home that not only wasn't regulating pressure anymore, it was leaking and making a mess. I have included a photo of the old setup. I was able to simply loosen the nuts, slide the old regulator out, clean the existing threads and mating surfaces, slightly dope up the threads on the new regulator, and carefully slide it in without pinching the O-rings. I didn't need to sweat anything, but the parts were provided to do that if necessary. Once I tightened it up, it worked like a charm and I had 50 psi. Unlike the old N35B, this one is adjustable, so I turned the screw about six revolutions and got 60 psi. This was so much less expensive and less time-consuming than calling a plumber, even including the cost of the big wrench I had to buy.

We had high water pressure at our house, and after measuring it, it was found to be a potential cause of several water leaks. After adding this regulator to the system, it was steady at 70 psig, which is typically plenty high for a household. Robust PRV.

Work great. Easy install and fit well no leaks. No tape/ dope need. Come with O ring.

The valve was easy to install and works great. And their tech support is top notch. When I contacted technical support, I was connected with the most knowledgable person that was more than helpful. After answering my questions, he also offered some helpful installation tips.

Perfect match

Just what I needed, fit perfectly in the place of the old one. Hope this one last twenty years like the first one.

This item looked new in the box.Had it installed ,it leaked like crazy ,took it apart ,it did not have any ,internal parts,no spring ,no gaskets .We had to take the old valve which was cracked apart ,use its parts ,and build this new valve .It seems to me ,somebody screwed up somewhere.I don’t think I’ll be buying from this bunch again ,poor quality control ,with higher prices ,such a shame to see a well known company ,send such an item out,and put a person in a bind ,I could have been out of water ,waiting to exchange it out.

At first I wasn’t sure I appreciate only having the one compression fitting but turns out that I needed the space so not having to deal with the extra 3/4” actually worked to my advantage. Pressure is now steady at 65psi adjusting from 50 to 65 too about 4-6 turns.

I like the size and a good name Watts

Pressure Tested & Works Perfectly

No more worries of the house flooding and no running water. The Pressure regulator arrived faster than expected. It was installed and works great. Thanks for the great service.

Missing parts cannot use