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Model # 3/4 LFX65BU

Internet # 203473938

Store SKU # 768031

3/4 in. Lead-Free Brass MPT x FPT Pressure Reducing Valve

This item has been discontinued.
The Home Depot no longer carries this specific product.



Model # 3/4 LFX65BU

Internet # 203473938

Store SKU # 768031

This 3/4 in. lead free cartridge style water pressure reducing valve is designed to reduce incoming water pressure to protect plumbing components and reduce the water consumption for commercial, industrial and residential applications. It features a lead free brass body, thermoplastic seat cartridge, NPT threaded union inlet and NPT female outlet connections, reinforced diaphragm, and a bypass valve to control thermal expansion pressure. The reduced pressure rating is set at 50 psi (345 kPa). The maximum working pressure is 400 psi (27.6 BAR) and temperature range is 33 to 180°F (0.5 to 82°C).

California residents: see  Proposition 65 information

  • NPT threaded union inlet by NPT female outlet
  • Great flow performance with low fall off pressure
  • Bypass valve controls thermal expansion pressure
  • Sealed spring cage for accessible outdoor or pit installations


Product Depth (in.) 
Product Height (in.) 
Product Length (in.) 
Product Width (in.) 
Valve Inlet Diameter (in.) 
Valve Outlet Diameter (in.) 
Compatible Pipe Material 
Maximum Pressure (psi) 
Maximum Working Temperature (F) 
Product Weight (lb.) 
1.94 lb 
Warranty / Certifications
Manufacturer Warranty 
Watts (the "Company") warrants each product to be free from defects in material and workmanship under normal usage for a period of one year from the date of original shipment. 


Rated 3.4 out of 5 by 8 reviewers.
Rated 5.0 out of 5.0 by Works As Specified Functions as described in manufacturer's specs. Compared to 20-year old worn out valve it replaced, it 1) Holds pressure at set point overnight in no-usage situation, instead of creeping up to city water main pressure. 2) Does not restrict flow much under moderate-usage conditions--when using water two different places, like someone watering the lawn with a garden hose and someone else using the kitchen sink, there is NOT a noticeable pressure drop. The Home Depot product title as it is listed above at this time is incorrect. It says "3/4 IN. LEAD-FREE BRASS MPT X FPT PRESSURE REDUCING VALVE". It actually has 3/4 in FPT (female pipe threads) on both sides. One side has a union connection. The union connects to the valve by a large brass nut. The female threads inside the large brass nut engage male threads on the valve. I don't know what size those male threads are, but it's not 3/4" MPT. This product has a flexible design. As far as I can tell, the union could go on either side (inlet or outlet). If you take the union off, both sides are threaded the same (3/4"FPT inside the bore, male threads for union attachment around the outside.) Nice. Or if you had another of the union pieces, you could have it with a union on both sides. If I had it to do over again, I'd try to get one of those. That would have made the installation easier, where it had to go into pre-existing piping where there wasn't much flex in the system on either side. The valve I review here is the Watts LFX65BU. They do have a model number for the double-union version LFX65BDU. I don't where the double-union version is for sale. July 1, 2014
Rated 1.0 out of 5.0 by Cheep valve Bought 4 of these valves after having a seal blow off at a rental home and then testing all properties. They worked fine at two of the rentals with a supply pressure between 100 and 120 psi. My house at the bottom of a hill and has supply pressure arount 150+psi. Put two different of these valves on and both sounded like a air horn in the basement. Do not trust the 300psi rating. Spent the extra $25 and get the double check valve, it is worth it to not have to redo the pipes twice. We also installed a different $40 watts valve and it failed after 3 days and was rated at 400psi. May 1, 2015
Rated 4.0 out of 5.0 by Watts were good Installation was easy as it was replacing an existing PRV whose seat was leaking. Increasing the output pressure above the factory set point created a chattering in the house piping. My input pressure is 140# which may be part of the problem causing the chattering but the old valve never chattered from day 1. Had to settle for 50# output to keep valve from chattering. Aside from this problem there is little pressure drop thru the valve and holds pressure when there is no flow. May 19, 2015
Rated 4.0 out of 5.0 by works fine The other guy must not have gotten all of the air bled out of his system. Mine does not hammer. I did have to take off the old flange nut and replace with the one that came with the unit. Mine (about 10 yr-old Wilkins unit) had different threads. December 5, 2013
Rated 2.0 out of 5.0 by Not for every house Our 3 bedroom, 2 bathroom house with CPVC piping needed a new pressure regulator. After installation however, this unit, when using any one water draw like a toilet, shower, or washing machine, had a resonance/pulsing issue. With pressure gauge attached it would oscillate between 30-50 psi at about 3 pulses per second (whoosh, whoosh, whoosh) and the pipes were shaking around. I talked to HD support who said it could be a restriction in the line to the house, which I tested and ruled out. He said to try another unit, which I did, with the same result. I got the Watts 3/4 LF25AUB-Z3 unit and the problem was fixed. I gave the unit two stars, even though it didn't work in my home, because it may work fine in many installations. If you get a pulsing issue, just get the more expensive unit. I can only choose yes/no on recommendation, so I chose no. Others have had good results, apparently. February 14, 2015
Rated 5.0 out of 5.0 by Fits perfectly. Fairly Easy to install and fits nicely. No more Whine like the worn out part. February 4, 2015
Rated 5.0 out of 5.0 by Works great! Had lots of banging and hissing in the main inlet prior to installing this. Now there is none. My installation was a bit of a pain but that is the fault of the person who installed the original one. Glad I didn't get one of the plastic ones because I dropped this on the kitchen floor before installation. Pressure is just over 50psi with nothing running, just under 50psi with a faucet and toilet running. November 22, 2014
Rated 1.0 out of 5.0 by NOISY AND CAUSED WATER HAMMER First time using this model of P.R.V. and it will be my last time! Installation is standard as with all female N.P.T. adapter valves. Factory setting was 50 PSI, adequate enough. The issue was once the water is turned back on. There was water hammer galore. First thought it was an old fill valve that needed to be replaced in an upstairs toilet. After that was done, the noise stopped.... only to return when another toilet was flushed and when the washing machine was used. After adjusting the PSI both up and down (thought the internal spring could be sticking) had to keep it set at 80 PSI. The unit should function normally within the manufacturer's recommended pressure range. It clearly did not. November 2, 2013
  • 2015-08-03T12:01:51.702-05:00
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Store Exclusive. This item is available for purchase in select stores only.