American Standard Flash Shower Rough-In Valve With PEX Inlet Elbows/Universal Outlets for Crimp Ring System - AMS-RU107E

The Flash rough-in valve sets between 1-3/4 inches and 2-3/4 inches from the finished wall to the back of the valve. That one inch of range is what lets you use it behind tile, thin panel, or a thicker wall build without repositioning the cross brace, and the plaster guard doubles as the depth guide while you set it. On thin-wall work the plaster guard can also act as mounting support.

It lands on 1/2 inch PEX crimp elbow inlets built into the valve, so PEX ties straight in with a crimp ring, no sweat joints and no threaded adapters. Fewer fittings means fewer leak points in the wall. The outlets are universal to ASTM F1807.

The rough-in body ships without the working cartridge. The cartridge comes with the trim kit, so you have to order the Flash trim separately to finish the shower. What is in the box is enough to rough in, pressure test, and close the wall: valve body, PEX elbows, stainless retaining ring, test cap and flush plug, and the plaster guard.

Yes, and without pulling a cartridge. The flush plug lets you flush the lines with no cross flow between hot and cold, and it tests to 200 psi with air or 300 psi with water. The stainless retaining ring has flats on it so you can loosen it by hand tool instead of backing out screws when you swap the test cap for the cartridge at trim-out.

Either direction works. The valve body is symmetrical, so it can be rotated 180 degrees to take supplies from above or below. Hot and cold can also be reversed quickly for back-to-back bathrooms where the stack feeds two showers off one wall.

Cast DZR brass, dezincification resistant, which is the reason to pick it where water runs high in chloride or sits at a pH that eats ordinary yellow brass. For a property manager standardizing across a lot of units that matters more than anything on the trim side, because the body is the part that stays in the wall.

Flat back. The valve sits flush against the cross brace rather than rocking on a curved body, so it lands square and holds its depth while you fasten it. Getting it square is what keeps the trim escutcheon flat on the finished wall later.

American Standard RU107E. That is the Flash rough-in valve configured with 1/2 inch PEX crimp elbow inlets and universal outlets. American Standard builds the Flash rough-in in several inlet configurations, so the suffix is what separates the crimp-ring version from the others, and the trim kit is ordered against the Flash platform rather than against this number.

No finish choice on the rough-in. The valve body goes in the wall and is sold unfinished, one configuration only. Finish selection happens on the Flash trim kit, which is where the handle and escutcheon come from.