Fuel Tap OD

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Hi Gents
I want to purchase a couple of dowty washer to fit over the fuel tap thread that screws into the tank, can someone advise on the fuel tap OD?

Thank you
 
Hi,
Ordinary 1/4 BSP dowty seals don’t work. I bought these on eBay. More like soft o rings bonded to the inside of a washer, designed to seal the thread when tightened flat. They are a tight fit and almost need to be screwed onto the tap. The plain washers are a must.
 
Les beat me to it. Stat-O-Seals are a common industrial item here in the USA. FYI, General Motors has been using them in it's automotive air conditioning systems for the last 10-15 years. Give me a day or two. When I have time, I'll go through my Stat-O-Seal assortment and see which size fits the fuel taps [aka petcocks]. Some links you might find useful.

http://allsealsinc.com/statoseals.pdf

Earls Stat-O-Seals

McMaster Carr Stat-O-Seals
 
 
14mm+ added: .550" OD actual for clearance, above washers fit into the threads
actually 567 is actually pretty good resistance against E-10
 
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