Adapt 1" threaded connections from a high capacity thru-hull intake fitting down to a 3/4" threaded connection for Attwood's Tsunami 800GPH wakeboard ballast pump. You'll need one of these fittings for each fill pump in your system.

You can also use this fitting along with Fly High's W747 to connect the T1200 pump to a high volume intake manifold made from 1" fittings.