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For the record, the new surplus "hat" cap fit perfectly. I just lightly sanded it and painted it with self etching primer and then flat black to match the master cylinder paint job. I also ordered and placed a "silicone brake fluid only" sticker.

Thank you for that description too!

Thank you so much Tinstar for measuring that so promptly for me. That was very kind of you and I appreciate it. Guyfang, thank you too for the offering of alternate part numbers and vendors, but I think I’d rather go by the eBay route as an assured purchase.

Thanks for the NSN! There's still one on eBay that is 3 times cheaper than Croft. Do you have any idea if the thread on yours 1-5/8" in diameter? (I just don't want to buy an NOS "hat" cap that is made for the smaller diameter opening rather than the larger 1-5/8" mouth on my new master...

Croft sent me exactly what I purchased, the exact same thing as you have, just with the marine grade finish (which is what I had ordered). It is a perfect fit. I apologize for not being more clear, but the master cylinder itself is not my question at all. I am not surprised that the cap is...

Yessir, that's the exact same as what I have listed and linked, except without the overly expensive "marine" finish. Same part number, just without the "-M". Good point about the standard cap on the new master cylinder being lower profile. I could see that optional rounded cap easily getting...

I wanted to discuss a minor difference between a older style master cylinder (probably original) off my 1997 Pribbs M101A3 trailer. First, a side-by-side comparison. The new one is (obviously) the shiny silver, which is the "marine" (wet environment) finish: Part Number: 10614-M...