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Are you sure its not a 1/2" pipe pet cock? Because that would have about a 5/8" external diameter.

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Yes, photos would be most helpful.  Most petcocks had a tapered thread on them.  The small sizes are usually found easily in swap meets-Hershey would be a great opportunity.  I may have a few in my stuff headed to Hershey in Oct but again, if you supply a photo, it would help tremendously.

Terry

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Actually, 3/8 NPT would have 18 threads per inch and be just about 5/8" OD at the wide end.  To clarify, are we talking about a petcock with STRAIGHT 5/8-18 threads that seals with a crush washer or gasket, or are we talking about a more common petcock with tapered pipe threads? If the latter, it's 3/8 NPT per your dimensions. Pretty common.

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Attached find photo of my problem. Apparently some time in the past when the engine was out of the car, some one drilled and tapped the block to the larger 5/8" x 18 dimension and used the square plug shown in the photo. I'd like to install a "normal" pet cock,  but with the engine back in the car and the steering column in the way, it's impossible to drill and retap for a smaller insert or bushing to accept a 3/8" or 1/2" pet cock. I'm unaware if anyone make a 5/8" x 18 pet cock. I've seached but can't find one.

pet cock.jpg

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