You can buy shower valves and trim in the Bay Area from plumbing supply counters, kitchen and bath showrooms, big-box stores and online fixture suppliers that deliver locally. Fixture Physician, the fixtures department of RemodelER, is one of the online options: it sells shower heads, valves and trim, and delivers across the San Francisco Bay Area. Wherever you buy, verify four things before you order: that the trim fits the exact valve going in your wall, that the valve type meets California's anti-scald requirement, that the valve supports the number of outlets you want, and that every visible piece comes in the same finish from the same brand. The first of these is the easiest to get wrong.
What is the difference between a shower valve and shower trim?
The valve, often called the rough-in valve, is the brass body that is plumbed into the wall. It mixes hot and cold water and is installed before the wall is closed and tiled. The trim is everything you see and touch afterward: the handle, the cover plate and, on many models, the cartridge that controls temperature.
They are frequently sold as two separate products, and they are not universal. A trim kit fits only the valve platform it was designed for, from the same manufacturer. A handle from one brand will not fit another brand's valve, and even within one brand, different valve families take different trims.
Where can you buy shower valves and trim in the Bay Area?
- Plumbing supply counters. Useful for rough-in parts and same-day needs, with staff who know valve platforms.
- Kitchen and bath showrooms. You can handle the trim and see finishes in person, and order through a salesperson.
- Big-box stores. Valve-and-trim kits you can take home, in a narrower range of styles and finishes.
- Online suppliers with local delivery. A wide choice of finishes, with the valve, trim and shower head ordered together. This is how Fixture Physician works.
What should you verify before you order?
| What to verify | Why it matters | How to check |
|---|---|---|
| Valve and trim compatibility | Trim fits only its own manufacturer's valve platform | Match the valve model number listed on the trim's specification sheet |
| Valve type | California's plumbing code requires anti-scald protection | Choose a pressure-balancing or thermostatic valve |
| Number of outlets | A head plus a hand shower or body sprays needs a diverter or separate controls | Count the outlets and confirm the valve and trim are made for that number |
| Flow rate | Shower heads sold in California are limited to 1.8 gallons per minute | Check the flow rate on the specification sheet |
| Connection type | The valve must suit the pipe in your wall | Ask your plumber which inlet connections they want |
| Finish | The same finish name can look different from one brand to the next | Buy the trim, head and accessories in one brand's finish |
| What is in the box | Some trims include the cartridge or the valve; many do not | Read the "includes" line and order the missing pieces together |
| Timing | The valve is needed weeks before the trim | Have the rough-in valve on site before the plumber's rough-in day |
Pressure-balancing or thermostatic: which valve do you need?
California's plumbing code requires shower and tub-shower valves to be pressure-balancing, thermostatic, or a combination of the two, so that a pressure drop elsewhere in the house cannot scald the person in the shower. Either type satisfies the requirement.
A pressure-balancing valve keeps the ratio of hot to cold steady when pressure changes, and usually has a single handle for both temperature and on/off. A thermostatic valve holds the temperature you set and normally has a separate control for volume, which suits showers with more than one outlet. Our guide to thermostatic and pressure-balance shower valves compares the two in detail.
When should you order the valve and the trim?
Order them together, but plan for two different deadlines. The rough-in valve has to be on site when the plumber roughs in the shower, before the walls are closed, waterproofed and tiled. The trim goes on at the very end. Choosing both at the same time guarantees they are compatible. Changing your mind about the trim after the tile is up usually means staying within the same valve platform, or opening the wall.
How does buying from Fixture Physician work?
Fixture Physician sells kitchen and bathroom faucets and sinks, shower heads, valves and trim, shower doors, toilets, tubs and bath accessories. In the catalog, each finish is listed as its own product, so what you add to your project is the exact finish you will receive. You can browse showers or shop by brand.
We operate online, so each product page carries the photos and specifications. Prices shown on the site are MSRP. Add the valve, trim and shower head to your project and send one quote request, and we reply with your actual project price, which is below MSRP. We deliver across the Bay Area, and the same quote can include tile, slabs, flooring and cabinets for the rest of the bathroom.
Frequently asked questions
Can I put new trim on my existing shower valve?
Only if the new trim is made for the valve already in your wall. Identify the valve's manufacturer and model first, then look for trims that list that valve as compatible. If nothing current fits, the valve has to be replaced, which means opening the wall.
Do the shower head and the trim have to be the same brand?
Not for function, because shower heads connect with a standard thread. For appearance it is safer, because finish names such as brushed nickel or matte black are not identical between manufacturers.
Does Fixture Physician sell to homeowners or only to plumbers and contractors?
Both. Homeowners can browse, add fixtures to a project and request a quote without an account. Contractors, designers and other trade professionals can apply for a free trade account, which adds trade pricing.
To start, browse showers, add the valve and trim to your project and request one quote, or call (408) 830-4458 with the model numbers you are considering.