1.5" schedule 10 or schedule 40. That is what everyone makes manifolds out of. ID is actually closer to 1 5/8" with an od of 1.9x"
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.