Abstract: A selectively engageable variable flow rate sink strainer which is selectively engageable by several complimentary and individually engageable components, and is especially adapted to providing strainer stopper and chemical functions to kitchen sinks and typical kitchen sink drains. Embodiments include ones which are variable between a maximum and minimum flow rate, the minimum rate being selectively adjustable to approximately zero, comprising a relatively alignable strainer and drain body and droppably removable and sealable strainer and an independently straining drain body and providing for chemical elements outside of a liquid soak volume and at the site of engagement of strainer and drain body.