Hot Tub Plumbing Pipe Sizes Explained
Choosing the correct pipe size can be confusing
|Help Article ID||36A|
At Hydrospares we realise that when it comes to choosing the correct pipe or fittings needed for your requirements, it can sometimes become a little confusing, especially when it comes to selecting the correct plumbing size. This Help Article is here to help you avoid the common mistakes made by so many when selecting the pipe & fitting size they need.
The first step is to measure your actual pipe's OD (Outside diameter) in mm. Using a set of Vernier’s is normally the quickest and most accurate way.
If you do not have access to a set of Verniers take a sheet of paper and wrap it around the pipe, mark where the paper overlaps. Straighten out and measure the distance in mm, this will now give you the pipe's circumference. Divide this by 3.14 which will provide you the pipe's diameter.
Now you know your actual pipe OD (outside Diameter) you can select the correct pipe size. Use the charts bellow work out the size needed based off your actual pipes OD (outside diameter) in mm. Match your measurement with one of the figures in the outer column (Actual Outside Dia. mm)
Note - Metric plumbing is not that common in domestic hot tubs and is more often used in Pools and commercial spas.