What size should a sink waste pipe be?

Some older sinks may have drains that connect to a 1 1/4-inch tailpiece, but most modern drains have a 1 1/2-inch outlet. All the pipes that connect to the tailpiece, including the P-trap assembly and all the horizontal extensions, are either 1 1/4 or 1 1/2 inches in diameter.

What size is waste pipe from kitchen sink?





Kitchen Drainpipe Connection
The drain has a threaded pipe sticking out below the lock nut that secures the drain to the sink basin itself. The drainpipe threads onto this pipe with a connector. Since the pipe is 1 1/2 inch in diameter, kitchen drainpipes are also 1 1/2 inches in diameter.

What is the standard waste pipe size?

Why does waste pipe come in different sizes – 32mm and 36mm – 40mm and 43mm?

Advertised Dimension Push Fit Diameter Solvent Weld Diameter
32mm 34mm 36mm (1 1/4″)
40mm 41mm 43mm (1 1/2″)
50mm 54mm 56mm (2″)
110mm 110mm 110mm

What size is UK sink waste pipe?

Common Waste Pipe Sizes in the UK
32mm – Found under small hand basins and other low volume outlets. 40mm – Used under kitchen sinks and also bathroom showers/baths. 50mm – Less popular and usually found in commercial buildings, occasionally seen in larger residential dwellings.

Are all basin wastes 32mm?

First and foremost wastes are all the same size 1 1/4″ or 32mm. Sometimes people get confused and ask why is there 2 sizes of basin wastes? the simple answer is that they are 1¼” BSP (32mm) and bath/sink wastes are 1½” BSP (40mm).

Is 32mm waste pipe the internal diameter?





Answer: 32mm is a nominal size. There is a tolerance allowed within the pipe dimensions so the internal diameter is between 29.6mm – 31.2mm and the outside diameter is between 34.4mm – 34.8mm.

What size is 32mm pipe?

Plastic Pipes Inch to Metric Sizing Guidelines

IMPERIAL METRIC
3/8″ 17.1mm 16mm
1/2″ 21.3mm 20mm
3/4″ 26.7mm 25mm
1″ 33.4mm 32mm

What is the OD of 32mm pipe?

The inside diameter of the pipe is 32mm and the outside diameter is 37mm.

Is waste pipe measured by ID or OD?

A two-inch pipe does not measure two inches on the outside diameter, but rather measures 60.3mm on the outside diameter. Conversely, in the metric system, the outside diameter of the pipe actually measures the same as the name of the pipe.

How do I know what size waste pipe I have?



Find the outside diameter of your pipe to the nearest millimetre, use a tape measure or vernier gauge. Then find this size down the left hand column, read across the four coloured columns on the right to find the group and description for your size pipe.

How do I know what size pipe I have?

Measure the Outside Diameter (OD) of your pipe or pipe fitting: Wrap a string around the pipe. Mark the point where the string touches together. Use a ruler or measuring tape to find the length between the tip of the string and the mark you made (circumference)