I received my new bulkhead fitting from Racetronix the other day and I can't find my dial caliper to measure the diameter. Anybody know off hand how big the hole needs to be for it to seal correctly?

http://www.racetronix.biz/customkiti...=BCWA-FL98&eq=

 

Use the existing hole.

 

There's already a fitting there. Trying to add a second one instead of epoxying the wires in place like I did last time. I'm getting safety conscious in my advancing years.

 

There is a spring lock clip on the inside. remove it and the fitting will come out.
Insert the new harness and install the new clip.
the new lock clip is included with the wire harness.
enlarge the image and look at the plug the clip is there.