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July 15, 2019 at 7:49 pm
#178948
I measured a few and the male part on the double line connectors is about 0.215″
The diameter for the single line connectors is about 0.245.
According to the NAPA/OMB chart posted above: 303598 has an ID of .225, 301824 has an ID of .197. but a -107 ring has an ID of 7/32 which corresponds to 0.219.
A metric 3 x 5 is close but not identical.
More than enough to confuse me.