If you have a BWT single point filling system (not Flow-Rite), you can use this connector allows you to use a Flow-Rite hand pump Pump.
BWT and Flow-Rite connectors are different, so the standard Flow-Rite connector will not work with a BWT filling system.
How do you know if you have a Flow-Rite or BWT filling system? BWT systems will typically have a float indicator on the top of each cell. Flow-Rite systems will usually have the Flow-Rite logo embossed on the manifold.