American Standard Flash Shower...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$149.99
$103.19
American Standard Flash Shower Rough-In Valve With PRX Inlet Elbows/Universal Outlets With Screwdriver Stops for Cold Expansion System - AMS-RU108ESS

American Standard Flash Shower Rough-In Valve With PRX Inlet Elbows/Universal Outlets With Screwdriver Stops for Cold Expansion System - AMS-RU108ESS

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Model: RU108ESS
Selected Finish is

In Stock (leaves warehouse same day if ordered before 3pm ET)

$149.99
$103.19
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Flash Shower Rough-In Valve With PRX Inlet Elbows/Universal Outlets With Screwdriver Stops for Cold Expansion System
  • Flush Plug: Eliminates the need to remove cartridge during installation and allows installer to flush the lines without cross flow. Can be tested using flush plug with air (200 psi) or water (300 psi).
  • Stainless Steel Retaining Ring with Flats: Secures test cap/ cartridge in place and eliminates need for screws. Flats make it simple to loosen ring for quick, easy insertion/removal of test cap/cartridge.
  • Flat Back: Allows valve to be mounted flush against cross brace for easy and solid installation
  • PEX Elbow Connections: Fast and easy installation without adaptors reducing leak points.
  • Symmetrical Design: Allows vavle body to be rotated 180ᵒ to accommodate supply lines from the floor or the ceiling
  • Cast DZR Brass Valve Body: Resists corrosion due to high chloride and pH levels in water.
  • Back-to-Back Capability: Hot and cold can be reversed quickly and easily.
  • Exclusive Plaster Guard: Plaster guard is designed to protect valve and act as a guide during installation. It can serve as mounting support for thin-wall installations.
  • Wide Rough-in Range: From 1-3/4" to 2-3/4" from finished wall to the back of the valve.
  • 1/2" PEX cold expansion elbow inlets/Universal outlets (ASTM F1960);Includes Scredriver Stops for easy servicing at the valve

Manufacturer Resources

Spec Sheet

Product Specs

Product Group:
Washroom/Bath
Product Subgroup:
Shower Systems
Product Type:
Rough In Valve
Department:
Plumbing
Country of Origin:
Mexico
Product Color:
No Finish

American Standard RU108ESS – Frequently Asked Questions

1) What kind of connections does the American Standard Flash RU108ESS shower rough-in valve use?
The RU108ESS rough-ins with 1/2 inch PEX cold expansion elbow inlets and universal outlets, built to ASTM F1960. Because the elbows are PEX-ready, you connect Uponor-style expansion tubing straight to the valve with no adapters, which cuts out a pair of solder or threaded joints per side.
2) How deep can the Flash RU108ESS valve be set behind the finished shower wall?
Rough-in range runs 1-3/4 inches to 2-3/4 inches from the finished wall to the back of the valve. That one inch of play covers most tile-over-backer and thin-wall assemblies without shimming the cross brace.
3) Can I pressure test the shower lines before the trim goes on with this American Standard valve?
Yes, and without pulling the cartridge. The RU108ESS ships with a flush plug that lets you flush the lines with no cross flow and test at 200 psi with air or 300 psi with water. A stainless steel retaining ring with flats holds the test cap or cartridge in place, so no screws are involved and the ring backs off by hand tool for the swap.
4) My supply lines come down from the ceiling instead of up from the floor. Will this rough-in valve still work?
It will. The Flash valve body is symmetrical and can be rotated 180 degrees, so the same unit takes supplies from the floor or from overhead. Hot and cold can also be reversed quickly for back-to-back installations, which matters when you are stacking two showers on a common wall.
5) Does the RU108ESS have service stops at the valve?
Yes. Screwdriver stops are included on the valve, so you can isolate that one shower to service or replace the cartridge instead of shutting down the riser. On a multi-family or hotel job that is the difference between one unit out of service and a whole stack.
6) Does the RU108ESS come with a trim kit or handle?
No. This is the rough-in valve body only, a Flash series shower rough-in. Trim (escutcheon, handle, and any diverter hardware) is ordered separately, which is how the plumber can set the valve at rough and let the finish selection happen later.
7) Is the American Standard Flash valve body brass, and how does it hold up in aggressive water?
The body is cast DZR (dezincification resistant) brass, chosen to resist corrosion where chloride levels and pH run high. That is the reason it gets specified for municipal supplies that chew up standard yellow brass.
8) What holds the valve square during framing, and does the plaster guard do anything on thin walls?
A flat back lets the valve sit flush against a cross brace so it mounts solid and stays plumb. The plaster guard protects the valve during rock and mud work and doubles as an installation guide, and on thin-wall assemblies it can serve as mounting support.
9) Is there a finish choice to make when ordering this shower rough-in valve?
There is not. The RU108ESS is offered in a single unfinished configuration because it is buried in the wall. All the finish decisions live on the trim kit you pair with it.
How fast can I get the American Standard RU108ESS delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the American Standard RU108ESS come with a warranty?
Absolutely. The American Standard RU108ESS is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the American Standard RU108ESS?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the American Standard RU108ESS from ZenSupply?
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