Connect one side of ports to exterior (below waterline), and the other to the ballast tank.
This can live inside a large tank, in which case leave the ports on that side as-is.
Ideally use two ports on each side (as it comes), but will still work with one if space is limited. Ports of any type work fine.
Paste multiple in parallel for higher throughput (do not connect their pipes!).
It can fill a tank quickly until the air pressurizes to ~55atm (mostly full), you can use a gas relief tank or vac pump to get 100% but in most cases it is not necessary. Pulling a full vacuum in ballast systems works, but it makes them empty at half speed, keeping the default air pressure is usually best.
Recommend a fluid spawner for tanks that should start partly or completely full, vs pumping on startup.
This is NOT a replacement for [vac pump+door] rapid fill systems, nor for [replenishable compressed air+door] blowing systems, but it will work in tandem with them. The goal here is efficient pump flow for controllable fill/empty.
