This handle is part of the COMBINATOR EASE system.

Lightweight - Simple click system - Can be used with any Moerman ruler, but the best results are achieved with the LIQUIDATOR 3.0 Ruler.

With this tool (including ruler, T-Bar and soak bag) you can either wash on one side, subtract on the other. Or you place the washer and subtractor after each other and you can wash and subtract in one movement!