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petrol tap

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In the NOC shop part no. SS14 C3 041323L is described as "Petrol tap: Lightweights only: 7/16 petrol tank thread - Use 1/8 BSP fittings: Lever type: All metal plated brass, New". I have bought one as my old push-pull tap continued to leak even with a new cork insert. The description is incorrect and has mislead me. I have found that the petrol tank thread is 1/8 BSP and the 7/16 thread is the one on the outlet. Unfortunately I have bought a Dowty washer that now won't fit the tank end of the tap and a 1/8 BSP spigot and nut that don't fit the outlet. The outlet thread od seems to be suitable for a nominal 7/16" thread but the TPI seems to be 19TPI according to my thread gauges. Does anyone know what this thread is so that I can buy the correct nut to clamp the spigot? Someone else must have bought one one of these taps.

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Hi David, l also bought this tap, 2 actually, and found the problems you have. After a lot of trial and error l discarded the nuts and tails and used old ones. It solved my problem but does'nt address the question of why the originals are incompatible. Neil

 

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Neil, 

You were lucky to have "old ones". The Ewarts tap I'm trying to replace has an integral spigot on the outlet.

David

 

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