Nispira Priming Pump Kit for Gravity-Fed Water Filtration Systems. It allows you to prime the black element filters BB9-2 at anywhere without a faucet or hose connections. Ideal for those who have small sink or short faucet in the kitchen or any other situation. Simply attach one end of the primer to the black element in water and draw the water through the element by repeatedly squeezing the pump until water run through the other end of the primer. Approximate Dimension after assembled: 12.5" x 2".