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

Easy to install. Affordable and works perfectly.

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

Just like the other reviewers have mentioned it was a perfect replacement for my old N35b. Didn’t need to do any soldering. Hopefully it’ll last as long as the old one

I got this to replace an older style one (1" n35b), which no longer worked and gave me 130 psi water pressure. The first one (Seen in pic by itself) I ordered came in the box, but it only had one washer, brass connector, and instructions. Didn't think much because that was how the one at the box store looked like when I opened the box to look at it. I installed it and it dropped my water pressure down to 60 psi. Then I flushed a toilet later that day and started getting this awful humming and vibration sound. It would randomly do it. I raised the pressure a bit, to only have the sound come back. So, I decided to change it again. The next one came (Pic with all the supplies) and it had a nicely sealed bag with the connector and two washers this time. The valve was nice, but I noticed it didn't have the Watts logo on it. It was definitely cleaner looking too. That is when I realized I must've gotten a used one on that first purchase. I put the new one in, and the pressure dropped back to 60 psi. I returned to other one noting the defect. Hopefully, no one else will get it. Be careful to make sure the contents are correct to avoid the hassle I went through. If this one acts up, I'll definitely update my review.Edit: It has been 3 weeks since I installed the new one. No issues so far and no vibrations.

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.

I bought one of these regulators June 2024 (8 months ago) to replace my failed regulator that had been on the house for 10 years. installation was great, delivery was fantastic, I thought everything was good to go for another 10-15 years. I wasn’t expecting that 8 months later I would come home to water pressure of 140 psi.Maybe Watts regulators are not what they used to be.Update 1. I took it apart and found that the regulator broke. You can see the metal tip broke and the rubber seal is showing. Not very impressed with this design.

This worked to reduce the incoming water pressure from 100psi to 70psi. Easy to install, easy to adjust to desired pressure and appears to be a well made durable product. Great value for the money. Not much more to say