Product review (5 stars): ... we were therefore not getting the siphoning action that sucks the water out of the tray
Our front-loader washing machine was pooling water in the soap tray for every wash and we couldn't figure out why until I consulted google and realized our white cap for the tray was lost and we were therefore not getting the siphoning action that sucks the water out of the tray. Bought this, and problem is solved! We saved ourselves an unnecessary handyman visit :)