My original looks like 1/2" NPT with a Bluskies anti-siphon valve & barbed fitting going to a 3/8 fuel supply hose , If I switch to the Moeller flexible fuel withdrawal , Its a 1/4 NPT , I would also have to switch to a 1/4" NPT anti-siphon valve with a 3/8 barbed ,this would be reducing the NPT size at the tank, I checked the owners manual of the engine and all it says about gas connection is the code section of US marine laws , the part where everything used has to be NMMA or ABYC certified for marine use, it does not say what size NPT fitiings are to be used for the application, so thats why I asked is 1/4" NPT ok for use on a 70HP Fourstroke? Thanks