Petcocks

Does anybody make decent petcocks that don't leak or bypass when turned off? Not sure if its alcohol in the fuel or just plain crappy pattern parts but I'm tired of drips and gas stains. The latest ones I installed have O ring seals as opposed to the cork rings like the Ewarts on my BSA, but every spring when I put them back on the road its the same old leaks.

The BAP's work flawless for me. http://www.klempfsbritishparts.com/PETCOCK--RESERVE--BAP-0 10 years service, but visually different, so no trophy for rivet counters.
Seal the threads with Locjaw 567.

IMO, the best high flow, no weep, ethanol proof taps are made by Pingel. However, they are not available in BSPP thread. But, 1/4 NPT can be recut to BSPP with the proper British die.
You also have to swallow a $100 US price tag.

Dynodave reports taps made by Dapco are good but must also have the threads recut to BSPP.

Slick

BAP.
Just feels good to use them , smooth.