Pillar Guide 02
Fixture
Compatibility
The most expensive mistake in a luxury bathroom is ordering a trim that does not fit the valve — or a faucet that does not clear the sink. This guide helps you get it right the first time.
Valve + Trim: The Foundation
Every shower system starts with a rough-in valve. The valve is the mechanical heart — it controls water flow and temperature. The trim is the visible part — handles, plates, and diverters.
Here is the critical rule: not every trim fits every valve. Each manufacturer has its own valve platform, and many have multiple platforms within their line.
Common Valve Platforms
Hansgrohe iBox Universal
The industry standard for flexibility. One rough-in body accepts all Hansgrohe and Axor trim sets. Install the iBox during rough-in, choose the trim later.
Dornbracht Concealed Bodies
Trim-specific rough-in bodies. You must know the exact trim series before ordering the rough-in. Less flexible, but engineered for precision.
TOTO Thermostatic Valves
Matched systems with dedicated trim. Confirm the valve series matches your selected trim before ordering.
Rough-In Dimensions That Matter
These are the measurements your plumber needs before walls close. Getting them wrong means opening walls later — which means new tile, new paint, and a very unhappy client.
Shower Valve Depth
Most concealed valves require 2.5 to 4 inches of wall depth. Confirm your wall thickness accommodates the valve body plus any extension kits.
Shower Head Height
Rain heads typically mount at 84 to 96 inches from the finished floor. Confirm the arm length and angle before setting the supply line.
Tub Filler Rough-In
Wall-mount fillers need supply lines at a specific height and offset from the tub rim. Floor-mount fillers need supply through the floor — confirm before pouring the slab.
Toilet Rough-In
Standard is 12 inches from the finished wall to the center of the drain. Wall-hung toilets with in-wall tanks require a carrier frame that must be set during framing.
Faucet + Sink Compatibility
A vessel sink sits on top of the counter, raising the rim 4 to 6 inches. A standard-height faucet designed for an undermount sink will not clear the rim. Always confirm:
- •Faucet spout height vs. sink rim height — minimum 2 inches of clearance
- •Spout reach vs. sink width — water should hit the center of the basin
- •Number of faucet holes vs. sink or counter drilling
- •Single-hole vs. widespread — this affects counter prep and cannot be changed later
The PGKB Compatibility Check
Before we ship a single fixture, our team reviews your entire spec package for compatibility. We check valve-to-trim matching, rough-in dimensions, faucet-to-sink clearance, and finish consistency across brands.
This is included with every order. No extra charge. It is how we protect your project timeline and your reputation.
Need a compatibility review?
Disclaimer
The information provided in the PGKB Learning Center is for educational and informational purposes only. While we strive for accuracy based on industry best practices and 20+ years of experience, this content should not be considered professional engineering, architectural, or legal advice. All projects must comply with local building codes, plumbing codes, electrical codes, and regulations set by your local authorities having jurisdiction. We strongly recommend consulting with licensed professionals — architects, engineers, plumbers, and electricians — before implementing any guidance from these guides.
Field Conditions & Measurements: All dimensions, measurements, rough-in specifications, and technical data referenced in these guides are provided as general industry guidelines only. Actual field conditions, existing construction, structural variables, and site-specific factors may differ significantly from published specifications.
Limitation of Liability: PGKB shall not be liable for any costs, damages, delays, or losses arising from the use of or reliance on this content. All information is provided for general reference only and does not constitute professional advice. Users are solely responsible for verifying all specifications, measurements, and conditions prior to purchase or installation.