Jet Pumps, Circulation Pumps

LX Pumps

It is often confusing when sizing a pump union. All the Hot Tub pumps in this section are sized as per USA imperial pipe size reference. Although we refer to 2 inch, 1.5 inch and so on, often the outside diameter of the threaded connection on the inlet and the outlet of the pump will be bigger than the size referred to. The reference is related to the internal bore of the pipe work used to plumb the pump in place. See our guide below

2.5inch = 90mm OD, 2 inch = 75mm OD, 1.5 inch = 62mm OD, 1 inch = 48mm OD


If you are unsure which pump you require, please send an image of your pump to