SharkBite brass 3/8-in OD Female compression x 3/8-in OD compression add-a-tee. Used to create an additional 3/8-in OD compression outlet on an existing stop valve. Attach an additional supply line to the 3/8-in compression outlet. Allow for an additional outlet on any supply stop valve. The swivel nut threads onto the supply stop valve, then the supply lines are threaded onto the male compression outlets. Lead-free brass construction.