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Thermowell Plumbing Fittings

In this Category you will find PVC Thermowells normally found as 90° ELL Slip X Slip Fittings. These Thermowells are glued into the plumbing system and accept either a High Limit and a Thermostat or just one of these Temperature Probes and are used to tell the control system what the actual temperature of the water is so it can control the temperature. These Thermowells are usually only found in the 1 ½” or 2” plumbing sizes.

This is a chart for the outside of your plumbing pipes so you can figure out what size parts to order. Threaded parts normally measure what they say they are and are not based on the part that would be screwed in see the chart below. Note: The actual size a part is called is not the actual size of the hole in the part it is really the Inside Diameter of the pipe that would glue into that part which doesn’t make sense, since you cannot see inside the pipe. Therefore I am giving you the measurements of the outside of the pipe so you know what size part to order.  For example a part that is ½” plumbing would glue into would actually measure ¾” inside the hole of the part and on the outside of the pipe that glues into the part.<br>


Pipe Outside Diameter chart:<br>

½” Outside Diameter is ¾”<br>

¾” Outside Diameter is 1”<br>

1” Outside Diameter is 1 ¼”<br>

I have never seen 1 ¼” in Hot Tubs<br>

1 ½” Outside Diameter is 1 ⅞”<br>

2” Outside Diameter is 2 ⅜”<br>

2 ½” Outside Diameter is 2 ⅞”<br>


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