By-pass outlet?
It's 3/4" NPT
http://www.fairburyfastener.com/xdims_pipe_threads.htm
1/8" pipe can "cheat" to connect 3/8" fuel hose
3/8" pipe can be used with 5/8" heater hose
3/4" is a little over 1" for things like hydraulic return hose
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