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Thanks. I'm guessing it is 1/8 NPT on the connector end - appears so in this Moeller version: http://www.amazon.com/Moeller-Marine-Connector-Mercury-Bayonet/dp/B000MTB7KQ/ref=sr_1_20?ie=UTF8&qid=1406634193&sr=8-20&keywords=mercury+fuel+line+fittings

Attwood also seems to make this connector out of nylon: http://www.amazon.com/Attwood-Mercury-Mariner-Fitting-4-Inch/dp/B000FJS85A/ref=sr_1_fkmr1_2?ie=UTF8&qid=1406634441&sr=8-2-fkmr1&keywords=mercury+attwood+fuel+line+fittings but I would prefer to stay with the aluminum.

I will get a 1/4 to 1/8 NPT nipple and see how I make out.

Tim