Well, alot of it is going to depend on how much material you have around the area you're going to install the nipple as well as what size hose you're connecting to. That's going to dictate the size of the fitting.
Most will probably be 1/8 NPT or 1/4NPT with 5/16 hose barbs. But there's a large number of smaller and bigger ones so you're just going to have to figure out which ones you want to replace and what fits in the part.
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