415C Wing Tank Sump Drains

I have the Alum. wing tanks (9 gal.) and they are 1/8" pipe thread. Don't use the
curtiss valves as they have no replacement seals when they start leaking.

Thanks for the relpy. I'l check it out.

I believe they are 1/4" NPT but please call Univair and confirm this before ordering any. (303-375-8882)

www.univair.com/miscellaneous/view-all/c...rain-valve-1-4-inch/

Hi All,
Can anyone tell me the size of the fuel sump drains for the wing tanks? I've got a 415C SN2507 . They're the pipe thread type and I want to be sure of the size when ordering without removing them first. Thanks