How to Choose a Tub or Shower Faucet

The single biggest cause of returns and leaks behind the wall isn’t a bad faucet. It’s a mismatch. Before buying any tub or shower faucet, match the fixture to three things: your tub type, your rough-in plumbing, and your connection style. Get those wrong and you’re either standing at the counter returning a box or cutting drywall to fix a drip you can’t see.

Here’s the short version. Freestanding faucets are for standalone tubs, mounting to the floor with exposed piping. Wall-mount faucets attach through the wall, ideal for alcove tubs where plumbing is hidden. Deck-mount (or Roman) faucets install on the tub rim or surrounding platform. Combo units integrate a showerhead and tub spout via a diverter valve, perfect for space-saving alcove setups. Once you know which one fits your setup, the rest of the decision falls into place.

Spout Types and Which Fits Your Tub

The fixture depends entirely on the tub and the plumbing layout behind it. Selecting the right fixture depends entirely on your plumbing layout and the type of bathtub you have installed. Run down the options:

Wall-mounted. The most common setup. These are the most common fixtures, extending directly from the bathroom wall above the tub. They are favored for their space-saving design and straightforward maintenance. They mount to a 1/2-inch or 3/4-inch NPT pipe and come in slip-fit or threaded to match your existing copper or iron.

Deck-mounted (Roman). These sit on the tub rim or a tiled ledge instead of the wall. Requires a specific valve body hidden beneath the tub deck. Best for large soaking tubs, drop-in tubs, and whirlpools. The catch: these spouts provide a high-end, integrated look, but they require precise drilling during the tub installation.

Diverter vs. non-diverter. This is the core distinction. There are two basic types of tub spouts: diverter style that allows you to send the flow of the water to either the tub spout or the shower with a diverter right on the tub spout and non-diverter style that flows only from the tub spout into the tub. A diverter spout uses a pull-knob or gate to redirect water up to the showerhead — the standard for a combined tub/shower. A non-diverter is a single-purpose outlet, and here’s why that matters: because there are no internal obstructions, non-diverter spouts usually offer a much higher flow rate. This makes them the ideal choice for filling massive 80-gallon tubs quickly without the noise and vibration found in diverter models.

One word of warning on diverters. When using a different type of tub spout with a diverter, look for “positive action” gates. Lower-quality versions often leak water from the spout while the shower is running, which reduces your water pressure and wastes hot water over time.

Handheld hybrid. A fixed outlet paired with a flexible hose and wand. Best for families with children, pet owners, or for easy tub cleaning. Worth the upgrade in a master bath — it allows for targeted rinsing and makes it much easier to keep the interior of a large freestanding tub clean after use.

Connection Type and Rough-In: Where Most Mistakes Happen

This is where returns get made. Check your rough-in plumbing before buying. You will likely encounter either a slip-fit connection, which slides over a smooth copper pipe and secures with a hex screw, or a threaded IPS connection. Matching the pipe diameter — usually 1/2-inch or 3/4-inch — is vital to prevent leaks behind the wall.

Two basic spout attachments, and you can tell them apart in seconds. A slip-on style bathtub spout will have a setscrew, which is a small screw located on the bottom of the tub spout. The slip-fit tub spout is designed to slip onto a 1/2” copper pipe without the use of any threads. The copper stub length matters: for slip-on tub spouts, your copper pipe should be a minimum 1” and a maximum 2-7/8” in length, depending on the tub spout. Refer to the manufacturer’s specifications prior to purchasing and installing to ensure you have the appropriate length for your spout.

Threaded spouts are the other camp. A threaded tub spout will not have a setscrew, and will twist off of the nipple or pipe. This style will either be a front-end threaded tub spout or a rear-end threaded tub spout. The rear-threaded type is the one you’ll see most in remodels: the wall end spout (also called “rear-threaded” spout) offers added convenience because it can be connected to a tub spout stub-out nipple (1/2” or 3/4”) at the wall end of the spout with a Celcon bushing. Rear threaded spouts can be used for either new or remodeling construction.

If your finished wall throws off the measurement, a telescoping spout buys you slack. A telescoping spout is also a type of threaded bathtub spout which provides flexibility for many installation applications by allowing an adjustment, usually up to 1”, to be made for the finished wall. The telescoping spout attaches to either a 1/2” or 3/4” nipple with a Celcon bushing.

Connection	How it secures	Pipe spec
Slip-on (slip-fit)	Setscrew on underside grips smooth copper	1/2” copper, 1” min to 2-7/8” max stub length
Front-end threaded	Twists onto nipple at outlet	NPT pipe
Rear-end (wall-end) threaded	Celcon bushing to wall nipple	1/2” or 3/4” nipple
Telescoping threaded	Celcon bushing, adjusts for wall depth	1/2” or 3/4” nipple, up to 1” adjustment

North American standard is NPT 1/2 inch. Verify before you buy, not after the box is open.

Valves: Trim Kit vs. Complete Unit, and Why Scald Protection Matters

This trips up more buyers than anything else: a trim kit may not include the valve body. Two faucets that look identical can be very different purchases.

Take two examples from the same series. The complete unit comes ready to go — the 144840-I tub/shower trim is a complete unit that includes trim and MultiChoice Universal Valve with rough-in. The trim-only version does not: the T17435-I is a trim kit only, and you must order the MultiChoice Universal valve rough (R10000 Series) separately to complete the unit. Same finish, same In2ition shower head — but one needs a separate valve and one doesn’t. Read the box.

On the valve itself, this is a safety call, not just a comfort one. A pressure-balanced valve holds your temperature steady when someone flushes a toilet or runs the kitchen sink. The Monitor pressure balance valve keeps water temperature within a safe ±3.6°F (±1.7°C), helping to protect you from sudden changes in hot or cold water pressure. That matters in Montana homes running on well pumps or older plumbing, where pressure swings are a fact of life. A balanced valve is what stands between you and a sudden blast of scalding water when the washing machine kicks on.

On flow and efficiency: WaterSense labeled shower heads use at least 20% less water than the industry standard without compromising performance, and shower trims in this class run 1.75 gpm at 80 psi. That’s plenty for a shower. But remember the tub-fill math — a big soaking tub wants a higher-flow non-diverter spout, not a restricted shower trim.

Materials and Finishes: What Lasts in Hard Water

Hard water is common across much of Montana, so mineral buildup is a real concern. Two things drive longevity — what’s inside the faucet and what’s on the outside.

Inside, the hierarchy is clear. Zinc alloy is common in entry-level housing — lightweight and inexpensive but prone to “pitting” and corrosion over time if the plating is thin. Solid brass is the gold standard. Brass is heavy, naturally antimicrobial, and can handle high water temperatures without expanding or contracting excessively. Most high-end spouts use a forged brass body because it provides a lifetime of service. That temperature tolerance is the part worth underlining here — Montana plumbing sees wide hot/cold swings, and thin-plated zinc handles that cycling worse than a solid brass body.

For finishes, the common options run chrome, brushed nickel, matte black, and champagne bronze, with polished and stainless variants in the mix. Match the finish to your existing hardware before anything else.

Against hard water specifically, look for two features. Wipe-clean spray holes: soft, rubber Touch-Clean spray holes allow you to easily wipe away calcium and lime build-up from the spray face with the touch of a finger. And spot-resistant finishes: SpotShield Technology helps your product stay cleaner, longer by resisting water spots and fingerprints. Both earn their keep in a hard-water bathroom.

Western Building Center’s tub and shower faucet stock includes a single-handle chrome tub/shower faucet, the Moen Adler tub/shower faucet in chrome, a 5/8-inch tub spout with diverter, and a 4-in-1 tub spout with diverter.

Installation and Replacement Basics

Most of these go in as DIY replacements. Identify what you’ve got before you shop. Grab a flashlight and look beneath the tub spout while it’s still attached to the wall. If you can see a tiny screw on the underside of the spout, you have a slip-on tub spout with a set screw. If there is no set screw, you have a threaded tub spout. A threaded spout can be removed by twisting it counter-clockwise.

Before you buy, measure the reach. A short spout is more than an annoyance — a spout with the wrong reach will cause water to splash against the tub rim rather than filling the basin cleanly, eventually leading to calcium buildup on the rim. Check stud placement and hole configuration too, so the new fixture lands where the old one did.

Two field tips that save grief. When you’ve got the setscrew loose, place a washcloth over the tub drain before loosening the setscrew to keep the screw from falling down the drain. And if you’re soldering, protect the cartridge — heat kills it. Pull ceramic cartridges before you put a torch to the connections.

Frequently Asked Questions

How do I tell if my existing spout is slip-on or threaded? Look underneath with a flashlight. A tiny screw on the underside means a slip-on spout with a setscrew. No setscrew means a threaded spout that twists off counter-clockwise.

Does a trim kit include the valve I need? Not always — and this is the most common buying mistake. Some units include everything; a complete unit includes trim and the MultiChoice Universal Valve with rough-in. Others are trim-only: a trim kit only requires you to order the MultiChoice Universal valve rough separately to complete the unit. Confirm before you leave the counter.

What pipe size do I need for a slip-on spout? Slip-fit spouts slide onto 1/2” copper pipe, and the copper stub should be a minimum 1” and a maximum 2-7/8” in length, depending on the spout.

Why does the water splash on the tub rim instead of filling cleanly? The spout reach is too short. A spout with the wrong reach will cause water to splash against the tub rim rather than filling the basin cleanly. Measure from the wall to the basin center before buying a replacement.

Will a pressure-balanced valve really stop temperature surprises? It’s built for exactly that. The pressure balance valve keeps water temperature within a safe ±3.6°F even when a valve is turned on or off elsewhere in the system. Useful in any home where a flushed toilet currently turns the shower scalding.

What’s the best material for hard-water durability? Solid forged brass with a ceramic cartridge. Brass is heavy, naturally antimicrobial, and handles high water temperatures without excessive expansion — most high-end spouts use a forged brass body because it provides a lifetime of service. Pair it with wipe-clean spray holes and a spot-resistant finish to fight calcium buildup.

Can I solder connections with the cartridge in place? No — pull it first. The ceramic cartridge takes heat damage, so remove it before soldering. Lay a cloth over the drain while you work so small parts don’t disappear.