The diameter of the drain is measured by taking the size of the opening at its widest point. From one edge of the hole to the other is a length of 1.5 inches.Dec 23, 2021

How do you measure a bathtub drain plug?

Measure straight down from the center of the overflow to the point at which the drain is mounted to the tub: depending on what’s easiest to get to, you can measure from outside the tub down to its underside, or from inside the tub to the tub floor. Do not follow the curve of the tub; measure straight down.

How do you tell what size drain you have?





Remember, for any product that goes in a drain, you will first need to remove the drain cover/grate before measuring. Then measure the diameter at the top of the drain hole. When in doubt, round up to the nearest size.

What size is my tub drain?

According to Bonnets Stems and Accessories, Inc., a standard modern bathtub drain is 1 1/2 inches in diameter – the width straight across the middle. Rough-in plumbing should be calculated for a 1 1/2-inch pipe.

Are bathtub drain sizes universal?

Shower or tub drains have different drain connection sizes to accommodate the pipe sizes of your plumbing drain system.

Are all bathtub drain threads the same?

One of the most confusing and annoying plumbing problems is replacing the bathtub drain (called a plug) that screws into the base (called a shoe). There are two common thread types (16 and 11 1/2 Threads Per Inch), and one uncommon one (14 TPI).

What size is a standard bathroom drain?





While a bathroom sink’s design and overall size may vary from one model to the next, the drain holes are fairly standard, 1.25 inches being a general standard, with widths of 1.5 inches and 1.625 inches also common. The size of the hole helps determine which size drain is needed for that particular sink.

How do I choose a bathtub drain?

When it comes to selecting a bathtub drain finish, look for a finish that will coordinate with the other finishes in the bathroom. It should complement the colors and finishes already chosen, from the sink faucet and vanity hardware, to the tub faucet and shower system.

How do you measure a shower drain?

Quote from the video:
Quote from Youtube video: Between your screws or where it snaps into the actual drain. So once you've determined your outside diameter you're going to measure.

Can I use 1.5 inch pipe for shower drain?

A 1 ½ pipe can be used for shower drain in some areas. It is effective for draining water in small bathtub areas but may overflow the shower base if the water flow is high. Though a 1 ½ pipe is not as efficient as a 2 inches shower drain pipe, it would suffice in small areas.

What size is a standard tub?



Standard tubs usually have external measurements around 60 inches long, 30 inches wide and 14 to 16 inches high. When shopping for a soaking tub, find a tub that measures between 60 inches long and 72 inches long. Persons over six feet tall may want to consider an oversized bathtub for the most comfort.

Why does a shower require a 2 inch drain?

A 2-inch pipe is the recommended size because showers have a low threshold for flooding, and a 2-inch pipe helps the water drain faster than does a 1 1/2-inch pipe. So, if you are converting from a tub and shower combination to a shower, you’ll likely have to change the drain pipe size.

Does a shower drain need a P trap?

According to regulations, all shower drains are required to have P-traps. This includes all fixtures connected to a building’s main plumbing system. P-traps are curved pipes installed under showers and drains of all kinds.

Does every drain need a vent?



Without getting too far into building science, a general plumbing rule of thumb is that every drain needs a trap, and every trap needs a vent. All those traps and drains are designed to prevent sewer gas from entering your home.

How far can P trap be from tub drain?

Plumbing Codes



P-Traps must connect to the same size drain outlet, with a diameter of at least 1.5 inches. The vertical distance from the fixture to the trap can not exceed 24 inches. The horizontal distance from the fixture to the trap should not exceed 30 inches.

What does the P stand for in P-trap?

A P-trap gets its name because it combines two 90 degree joints with a horizontal overflow pipe and gives the entire unit the shape of the letter “P.” One of the 90 degree joints exits the drain of the sink and then is joined to another which contains a water seal system that allows for water to flow into the overflow …

Are all P-traps the same size?

Kitchen sink P-Traps come in 1-1/2” standard size, while bathroom sinks use P-Traps of 1-1/4” standard size. The traps also come in different material types such as propylene, ABS, brass (chrome-plated or natural), and PVC. You should use the material that is currently in place when replacing a P-Trap.

Can you have 2 P-traps in series?



It is perfectly fine to have (2) “P” traps , one on eash sink of a (2) sink setup. As long as the “P” traps are not Double Trapped ( more than one trap serving a fixture ) then it is fine as long as the weir is sized correctly.

Can a shower drain have two P traps?

What you can’t have is one P trap in line with another (creating an air locked section), but two P traps that connect to a Y and enter the wall should be perfectly fine.

Can two drains share a vent?

Common vent



This very simple concept allows two traps to be vented by the same vent. The two traps and their fixture drains can be either at the same level or at different levels, provided that they are on the same floor. The following diagrams show some of the various approaches to common venting.