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Ordering the right whirlpool bath pump. The difference between Metric and Imperial fittings.


Are you looking for a replacement whirlpool bath pump? First thing you need to do is check to whether your existing pump has metric or imperial fittings. The easiest way of doing this is by measuring the thread size. See the diagrams below showing both imperial and metric thread sizes. Measurements shown are in milimetres. Click on pump images to enlarge.

Imperial Whirlpool Pump

The diameter of the thread should measure approx. 2 inches. The teeth of the thread are fairly course compared to that of the metric pump and, as shown in the diagram on the right, you should count 5 teeth per half inch.

Whirlpool Bath Pump, Imperial Thread

Metric Whirlpool Pump

The diameter of the metric pump is slightly wider than that of the imperial and should measure approx. 2 inches. The teeth are quite smooth and closer together, measuring 7 teeth per half inch.

Whirlpool Bath Pump, Metric Thread

If you are still unsure about which whirlpool pump you require, you can call our technical support line mon-fri from 8.30am-5.00pm otherwise please follow one of the links below to buy online.

Imperial Whirlpool Pump - Buy Online | Metric Whirlpool Pump - Buy Online

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