Every fixture we sell has a spec sheet behind it — usually a one- or two-page PDF with a line drawing, a dimension table and a block of fine print. Most shoppers never open it. Most trades open it before they quote. That gap explains a remarkable share of returns.
The good news is that reading one properly takes about a minute once you know where to look. Here's the routine, in the order that catches the most expensive mistakes first.
1. Go straight to the dimension drawing
Skip the marketing page. The dimension drawing — the line art with arrows and numbers — is the document. It tells you whether the thing physically fits and whether your plumbing lands where the fixture expects it.
What you're checking depends on the category:
- Toilets: rough-in distance from the finished wall to the drain centre, plus overall depth and the distance from the wall to the front of the seat. A bowl that fits the rough-in can still block a swinging door.
- Faucets: hole spacing (single-hole, 4-inch centreset, 8-inch widespread), spout reach and spout height, and the deck thickness the shank will accept.
- Tubs: outside length and width, but also drain location measured from the end and the side, and the height of the rim relative to the filler you intend to use.
- Vanities and sinks: cabinet depth versus counter overhang, cutout template dimensions, and where the drain sits relative to the back wall — a drawer bank behind a shallow sink is a classic collision.
- Shower bases: outside footprint, drain position, and threshold height.
Two numbers deserve special suspicion: nominal size and actual size are not the same thing. A base described as a 60-inch unit may measure slightly under, by design, so it fits a framed 60-inch opening. Build to the drawing, not the product name. Our guide on matching shower base sizes to your space and drain works through exactly this trap.
2. Check what's actually in the box
Somewhere on the sheet there is a components list, and it is the second-biggest source of surprise. Common examples across categories:
- A shower trim kit that does not include the rough-in valve behind the wall — sold separately, often by a different part number.
- A toilet sold as a bowl only, with the tank, seat and supply line each ordered individually.
- A tub with no waste and overflow, because the drain is chosen to match the faucet finish.
- A vanity listed without a top, or with a top but no faucet.
- Mounting hardware for a wall-hung unit that assumes in-wall blocking you haven't framed.
None of this is a trick. Manufacturers split components so you can mix finishes and configurations. But it means "I ordered the shower" and "I can install the shower" are different statements. If you're new to that split, our guides section covers the rough-in-versus-trim logic in detail.
3. Read the flow rate and pressure notes
Flow rate is listed for faucets, shower heads and shower systems, and it's not just a conservation figure — it's a compatibility figure. Where a spec sheet lists a minimum operating pressure or a recommended supply size, take it seriously. A multi-function shower system running a head plus body sprays plus a hand shower can ask more of a supply line than an older home delivers, and the symptom is a shower that feels weak rather than one that fails.
For toilets, the corresponding number is flush volume, and dual-flush models list two. Both matter if your municipality has rebate programs or your drain run is long and shallow.
4. Confirm certifications for your jurisdiction
Canadian installations generally need fixtures certified to the relevant North American standards, and the spec sheet lists which ones a product carries. Inspectors do check, and imported fixtures bought outside the usual supply chain are where problems appear. If a sheet is vague about certification, treat that as a red flag rather than an oversight — and confirm requirements with your local authority, since they vary by province and municipality.
5. Decode the finish code
Most manufacturers append a finish code to the base model number — a suffix like -PN, -BN, -MB or a numeric equivalent. Two things go wrong here. First, the same finish name can mean visibly different colours across brands, especially in the gold and bronze families; matching across brands by name alone rarely works. Second, some finishes are made to order with long lead times, which is worth knowing before the tile goes in rather than after.
If you're specifying drains and stops to match a faucet, the finish codes on the sink drains and bath drains ranges are where the match either happens or doesn't.
6. Skim the warranty and service notes
Last thirty seconds: check whether the warranty is residential or commercial, whether the finish is covered on the same terms as the mechanism, and whether replacement cartridges and internal parts are stocked separately. On premium fixtures, long-term parts availability is a large part of what you're paying for, and the spec sheet usually says so plainly.
A worked example
Say you're buying a two-piece toilet. Sixty seconds with the sheet tells you the rough-in it's built for, the overall depth, whether the seat is included, the flush volume, whether the supply line comes in the box, and whether the trip lever is available in your other fixture finishes. Miss the rough-in and the fixture is unusable; miss the seat and you're a return trip away from finishing. The rough-in measuring guide covers how to take that measurement in your own bathroom before you compare it against a sheet.
Do this before you order, not after it arrives. Every fixture on our site links its manufacturer documentation, and if a spec sheet is missing for something you're considering, ask us — we'd rather find it for you than process a return.
Frequently asked questions
Where do I find the spec sheet for a product?
Manufacturers publish them as PDFs, and product pages link them alongside installation instructions. If you can't find one, the model number plus "spec sheet" usually turns it up on the manufacturer's site — or ask us and we'll send it.
What's the difference between a spec sheet and installation instructions?
The spec sheet is for deciding and ordering: dimensions, options, certifications, what's included. The installation instructions are for the person doing the work. Read the spec sheet before you buy and hand the instructions to your installer.
The spec sheet dimensions don't match the product listing. Which is right?
Trust the manufacturer's spec sheet, and tell us about the discrepancy. Listing dimensions are sometimes rounded or entered from a nominal size, while the spec sheet is the engineering document the fixture is actually built to.
Do I need a spec sheet if a plumber is doing the work?
Your plumber will want one — often before quoting, because it determines the rough-in work. Sending the spec sheets along with your fixture list is the single most useful thing you can do to get an accurate quote.