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Webstone

Webstone, a brand of NIBCO E-X-P E2 Tankless Water Heater Service Valve Kit, Hot & Cold, Full Port, Hi-Flow Hose Drains, Pressure Relief Valve Outlet, Adjustable Packing Glands, 3/4 in

  • Based on 1,116 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon
Arrives Saturday, Oct 17
Order within 17 hours and 56 minutes
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Size: 3/4


Features

  • Lead Free - Meets all federal & state standards for lead levels in drinking water system components.
  • Size is 3/4in
  • Tankless Water Heater Service Valves
  • 1 per carton - 10 per case - Individually Priced & Sold
  • Includes a residential pressure relief valve (150 PSI/200,000 BTU)
  • 500 WOG
  • 4444 series - IPS Union x IPS
  • Compact version of Webstone's original Isolator EXP
  • Certified to NSF/ANSI 61-8 and comply with the lead requirements of AB1953 and Annex G

Description

3/4 IPS LEAD FREE ISOLATOR EXP E2 w/LEAD FREE PRESSURE RELIEF VALVE TANKLESS WATER HEATER SERVICE VALVES - HOT & COLD SET - FULL PORT BRASS BALL VALVES w/ADJUSTABLE PACKING GLAND, HI-FLOW HOSE DRAINS (500 WOG) & PRESSURE RELIEF VALVE (150 PSI/200K BTU) From the Manufacturer Hot and cold set of full port forged brass ball valves with hi-flow hose drains and pressure relief valve outlet.

Material: Brass


Brand: Webstone


Item dimensions L x W x H: 9 x 6.5 x 3.75 inches


Exterior Finish: Brass


Inlet Connection Size: 3/4 inches


Inlet Connection Type: IPS Union


Outlet Connection Type: G Connector


Maximum Operating Pressure: 150 psi


Number of Ports: 5


Outlet Connection Size: 0.75 inches


Brand Name: Webstone


Model Number: P704RLF134


Number of Packs: 1


Global Trade Identification Number: 31


Unit Count: 1 Count


Manufacturer: Webstone


Manufacturer Warranty Description: Webstone, a brand of NIBCO warrants all of its products to be free from manufacturing defects in material and/or workmanship for the life of the product provided they are professionally installed and operated under normal conditions. Webstone will replace, FREE OF CHARGE, any product or part thereof that proves defective in material and/or workmanship under normal installation, use and service.


Number of Items: 1


UPC: 018394440432 708399742388


Included Components: valve


Item Type Name: IPS Isolator EXP E2 Tankless Water Heater Service Valve Kit


Item Weight: 1.7 kg


Item Width: 6.5 inches


Number of Pieces: 1


Set Name: Hot & Cold


Manufacturer Part Number: H-44443WPR


Exterior Finish: Brass


Inlet Connection Type: IPS Union


Outlet Connection Type: G Connector


Maximum Pressure: 150 psi


Number of Ports: 5


Thread Size: 3/4 inch


Thread Type: NPT


Connector Type: FIP Union × FIP


Valve Type: Ball Valve


Item Dimensions: 9 x 6.5 x 3.75 inches


Inlet Connection Size: 3/4 inches


Outlet Connection Size: 0.75 inches


Size: 3/4


Material Type: Brass


Specification Met: NSF, ANSI 61-8, AB1953, Annex G


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, Oct 17

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Similar Products

Top Amazon Reviews

    • Great premium valves
Review Image by Aaron Woodwell
These are very nicely made pieces of plumbing equipment. They have a couple features(that I'm not sure are unique to this set) that at first seam mundane then prove very useful. First, is how they attach to the unit. It's a union fitting where you first attach an adapter to the inlet/outlet of the heater, then when you've got the rest of your plumbing lined up, you join the union fitting at the top of the valves to the tank. If this feature did not exist, you'd have to spend another $20 on unions to plumb it correctly. Second, is the fact that the service side of the valves are separately gated. On some cheaper models, turning the service handles(the yellow ones) would close the inlet/outlet and open the service ports. Well, that works well enough, but what if I want to fill a bucket with hot water right from the heater, or connect a hose to the cold water inlet? With these valves it's easy. When the valves are in their normal "on" position, you can simply use them like a hot/cold water hose bib. Quality wise they seem great. Though a bit pricey at $75, you get what you pay for and I'm really happy I didn't cheap out and plumb my new heater without them. ***My Rating Definitions*** 5 Stars: Works exactly as advertised, fit/finish are what you'd expect when purchasing this type of product AND it is a good value 4 Stars: Works exactly as advertised, fit/finish are what you'd expect when purchasing this type of product, might have a minor flaw 3 Stars: Generally works but I'd change a few things 2 Stars: Barely works but can be made useful if you try 1 Star: Useless, does not perform it's intended function whatsoever and is generally a waste of money ... show more
Reviewed in the United States on March 10, 2016 by Aaron Woodwell
    • Service Ports meet the need
Quality service ports used for flushing lime from tankless water heater and allowing quick draining in winter of needed. I would definitely buy again if the need arose.
Reviewed in the United States on January 25, 2026 by Don Baker
    • High Quality and Durable - May need pink water resistant thread
I used this set for a tankless hot water heater, and it worked very very well! It's very heavy duty, has a blow off valve, and separate cleaning valves. The shut offs do require a bit of pressure, but I can confirm they work well. The O-Rings are not leak proof! You will want to use a water resistant thread, which was not recommended/required for everything I read about copper fittings, but I needed pink thread all the same. Beyond that, if you are not a plumber or have a similar skillset, use a plumber wrench to install these valves. It will help to keep the soft copper from being marred. All of that leads to to this point - these are high quality, they are worth the price, and I'm very satisfied with their performance. ... show more
Reviewed in the United States on November 25, 2018 by Nathaniel
    • Small leak after 8 years
Review Image by SZ
Review Image by SZ
Just bought the same valves that I bought 8 years ago. This review is for the old ones: overall, the valves are of decent quality. Have been doing flushing (with Vinegar) once every two years. Our local water is not that hard. The valves have been working well till the last time one month ago. It started small leak from the source to heater side when turned off on both hot and cold sides. I checked the ball valves inside and saw them got some degree of corrosion with hot side being a bit worse. Not sure about material (they don't stick to magnet). But I am a bit surprised that the supposed stainless ball valve can corrode. But overall 8 years of service is not that bad. ... show more
Reviewed in the United States on July 30, 2025 by SZ
    • Same store quality and brand but better price
I installed my tankless water heater a year ago without installing this kit due to how expensive it was at the local Lowe's and Home Depot. I figured I could wait a year and purchase it at the time my first maintenance service to my water heater was needed. I am happy I looked here before going back to one of the two local stores. I found it here much cheaper. They are the same brand and quality. I installed and performed the maintenance on my water heater. The only thing I would like to mention is that I found a large brass shaving in one of the service ports as I was checking the valves before installation. I don't know if this would of caused any damage to my system at the time of service but I am glad I checked them first before installing. ... show more
Reviewed in the United States on October 27, 2018 by Los
    • Make sure you get this and clean out your HWH.
Best investment you can make. Took a little bit of modification in my application but is pretty much a plug and play system for a standard Cold Water Heater...don't know why they call it a Hot water heater? Isn't it heating Cold water to make Hot water? Why do you Park on your Driveway and Drive on a Parkway? Anyway back to the subject matter...I was able to install and clean out over 5 years of build up in my Titan heater, the water that came out, the before and after was amazing. I tested the temp of the water before cleaning; 108F. After cleaning the temp of the water is now 120F. So yeah, this thing is making the heat go up and the electric bill down. If you have the Tank type heater, make sure to clean out the mineral build up at the bottom of the tank, you will be surprised at how much junk/sediment is laying at the bottom of your tank. You can do this by turning off the power to the unit, drain the tank connecting a garden hose using the spigot valve on the lower portion of the tank. After most of the water has drained out take off the access panel of the lower heating element, then take the heating element out and reach in with a shop vac, Wet/Dry type of course. Hopefully you have thought of buying/ordering before hand (because you read this informative review) the replacement element so that you can replace it either before or after flushing the system...up to you. There are a lot of opinions out there as what to use to flush the system with...Vinegar, Lime-A-Way or Citric acid. Depending on your water hardness and the area you live in, results may vary. After a couple of attempts you will find what works the best. BTW, always read the directions of dilution of the solution. Make sure you use your safety protection...eyes and hands and possibly a respirator as fumes can accumulate in a closed in area such as a garage or closet, also keep plenty of rags or towels close by for spills. Use proper ventilation by opening any doors or windows and use fans if necessary. Be safe Boys and Girls!! ... show more
Reviewed in the United States on April 17, 2018 by Joey S
    • Did the job. Good quality.
I was having trouble with my tankless water heater. After researching what I should do everyone said the first thing to try is flushing out the system with vinegar. I bought the house with the unit installed already so of course it didn't have the flush valves so I went ahead and ordered these and put them in. They are definitely built really solid and I had no troubles installing these. I flushed my heater with CLR solution for about an hour and low and behold the heater is working like a charm now. I would recommend these for any tankless heater install. ... show more
Reviewed in the United States on April 24, 2017 by chris
    • Gotta have it (even though they're pricey)
Very well made and quite a good idea for tankless heaters. It made for a really clean, tight installation, and the other outlet allows for yearly flushing of the heat exchanger. Too bad it includes an over-priced pressure relief valve, which is available at any hardware store. But these valves aren't. I did find I had to tighten the unions very tight. Otherwise, they tended to rotate when I was installing the plumbing. Nice seals! ... show more
Reviewed in the United States on September 11, 2017 by John Hulburd

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