Extends the faucet shank through thicker countertops such as granite, tile, marble, etc. so they can be connected to the water supply line. For use with countertops up to 4 In. thick. Strong PVC construction means product will not crack. Includes a rubber washer as an added seal. Easy-to-follow instructions make for a simple installation. Warning: This product can expose you to chemicals including DEPH Di (2-ethylhexyl) Phthalate which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. - Diisononyl phthalate (DINP)