NPT or National Pipe Thread is measured by the inside diameter of pipe , not the outside of the threads.
NPT male pipe threads are tapered and have outside diameters of:
3/8” 0.645- 0.675
1/2" 0.810 - 0.840
If you are unsure if this is the correct filter, please send us your model serial / serial number and we will be happy to help.
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