I'm 68 yrs. old and when growing up on my dad's dairy we had 4 of these for our Surge milkers. They allow the bucket to drain completely after washing. In 1973 my dad sold his dairy and I continued milking a cow or two for my family's use and for all but a few years I have continued. I hadn't found these until I visited Hamby's site. Great product if you are still using the Surge bucket milker.