My Via Aqua came with 3/4" barbs installed in 1/2" NPT openings. NPT thread sizes are for the inner diameter - if you measure the threads, they will be closer to 3/4".
My 1300 came with barbs, and all kinds of adapters in the box (all of which may be useful for aquarium use, but useless for WC). I substituted the 3/4" barbs with 5/8" OD, 1/2" NPT barbs with some thread sealant - works great.
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