[mreid]

On every SBF water pump I've ever seen, those nipples were pressed in. The other option that works well, but is not the best looking (works in a bind) is to cut a short length of hose (3 " or 8 cm), fit a bolt that fits snuggly with a clamp in one end, and slip the other end with clamp over the nipple. You only need one as the thermo bypass should be used and the intake manifold fittings are all threaded.