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Febco U765 1 in. PVB Backflow Preventer w/ Union End Ball Valves

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Free Shipping on Orders over $149
Sale Price $130.98
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Febco 765 PVB Backflow Preventer with Union End Ball Valves

Series 765 Pressure Vacuum Breakers are designed to be installed to provide protection against back siphonage of toxic or non-toxic liquids. They feature a durable bronze body and a check valve and air opening port in one assembly. Maximum Working Pressure: 150psi (10.3 bar).

  • All bronze body for durability. One check valve and an air opening port in one assembly.
  • Lightweight poppet seals air opening under minimum flow conditions.
  • Simple service procedures. All internal parts serviceable in line from the top of the unit.
  • Designed for minimum head loss.
  • Engineered plastic bonnet protect valve bodies from freeze damage.
  • Optional union end ball valves for easy removal and ultimate freeze protection.
  • End Connections - NPT ANSI/ASME B1.20.1
Product Tag:
Top of the Line
Backflow Size:
Lead Free:
Not Lead Free
End Connection:
Union End Ball Valves
Size (in.):
Union End Ball Valves
Lead Free:
Not Lead Free
Max Working Pressure:
150 PSI
Temperature Range:
32F to 140F
Pressure Vacuum Breaker (PVB)
1 Year
Test Cocks:
Stainless Steel
Hydrostatic Test Pressure:
300 PSI
Main Valve Body Materials:
Average Rating:
5 Stars, 4 Stars , 3 Stars , 2 Stars , 1 Star
5.0 / 5.0
3 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Just what I ordered easy install
Awesome, the union valves made it a plug in installation, instead of a pipe sweating nightmare.
July 1, 2017
over 2 years ago
Looks like plumbing jewelry
Easy to install, and it just looks so shiny and brassy. I like that I can take it indoors during the frozen months.
September 16, 2017
1 year ago
Was exactly what I needed. Was received promptly. Thanks.
May 3, 2018
1 year ago
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 6 questions Browse 6 questions and 10 answers
Why did you choose this?
SprinklerWarehouse.com Store
B A on Aug 28, 2018
Current valve burst, Replacing, like this valve has unions for easy removal.
W B on Nov 11, 2017
B A on Aug 28, 2018
wanted the unions included
Robert P on Mar 25, 2018
Current valve burst, Replacing, like this valve has unions for easy removal.
W B on Nov 11, 2017
Needed one installed and this one had the union connections.
O W on Oct 9, 2017
return customer
G I on Apr 25, 2017
It was a straight replacement part.
Chuck P on Apr 3, 2012
wanted the unions included
Robert P on Mar 25, 2018
Needed one installed and this one had the union connections.
O W on Oct 9, 2017
I am replacing a Febco 765-100 with this unit.
I presume I still need to purchase two (inlet/outlet) 1" brass unions, and just not use one of the fittings that come as part of the union, substituting the one I remove with the one that is part of this unit. Is this correct?
Thanks in advance.
Quint on Dec 14, 2013
Can I order just the union ball valves for the FEBCO765-100?
Murray E on May 16, 2015
how to winterize this system?
marie V on Mar 31, 2012
BEST ANSWER: The idea is to get all the water out of this backflow preventer, so that in the event of a hard freeze, it will not crack and leak after the thaw. Here are the steps to follow once the cold weather has set in the need for regular watering has passed for the season:
1. Shut off the water to the sprinkler system (turn the bottom gate valve so that the handle is horizontal (as shown in the picture)
2. Manually turn on the sprinkler system so that the solenoids will open and the water will drain from the output pipe and valve from this preventer (the upper gate valve and pipe attached to it). This will empty water out of the portion of the sprinkler pipe that is above ground.
3. Once this is done, turn the top gate valve so that the handle is vertical (as shown in the picture). This will keep the pipe clear from anything that may come in.
4. Take a screw driver and open the two little drain valves at the upper right on the picture -- this will drain any water that is still in the preventer bowl. Leave these open.
5. Now, there should be no more water in and around the preventer to freeze, expand, and crack the preventer. If you are still concerned, you can unscrew the union joints and remove the entire preventer assembly, leaving the union ball valve ends in place in shut off position, and put it somewhere it will not freeze. However, if you have properly drained the water, that should be unnecessary -- but you may be worried about a buildup of condensation (the small screwdriver openings should prevent this) or are tired of buying new backflow preventers, are worried that the plastic parts will become brittle in the cold, or otherwise just want to play it safe.

To un-winterize the system, just reverse all the steps until you re-open the gate valve at the bottom and re-charge the system with water. Do this slowly, or the onrush of water may crack the plastic parts inside, which may have become brittle.
I cannot see a difference in the Union Ball valve ends. Aren't all of the rotary valves "ball valves"?
Mark G on Jul 16, 2016
BEST ANSWER: Yes, we found that they are all ball valves. However, this model has a coupling included in the unit and the product available at the big box stores does not. This coupling allows you to remove the backflow valve from the system.
Will the yellowjacket repair kit work on a 25 year old 765-1 febco backflow valve?
charlie on Aug 4, 2016