These (Twin Tech 24003) , (WIX 24003, 24744, 10429) / (NAPA 4003, 4744, 600429) style filter caps have (1 7/8" x 16 threads per inch O.D. thread) by 1/4"NPT I.D. thread. They are made form 6061 T6 aluminum and are less than 1/2 the weight of our stainless steel filter caps. Weight 2.1oz. (59grams)
The center hole of the 1/4-NPT cap is drilled thru to .453" diameter and threaded with female 1/4" National pipe threads so you can attach a 1/4" pipe plug or valve with 1/4" NPT thread.
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Posted by Butch P. Wilson, NC on Mar 1st 2019
Filter cap arrived rather quick and was exactly as advertised to fit my needs. Thought was fair as well. Twin Tech in my opinion is a cut above the rest and I wouldn't hesitate to refer to a friend.
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