need for tight fit

A quick learner from kokomo,in says:
What is the over all diameter for the white cap
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Tom from SWISCO responded:

Hello! I'm not at the office at the moment due to the quarantine, so I can't measure. However I'll reach out and see if anyone is still in today to get that measurement for you. I'll get back to you ASAP.

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Tom from SWISCO responded:

Hello once again! I was able to have a colleague measure this part for us. The diameter of the white cap is 1/2".

Please let me know if you had any questions, we're always here to help.

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