Duck Bill Valve Kit - 1-1/2"The Dometic Duck Bill Valves Kit comes with two (2) 1 A 1/2" duck bill valves for "T" and "S" series pumps. These valves are a critical component of the VacuFlush system. They help maintain and generate the vacuum for the system and should be replaced frequently. Legacy # 385310076*Sold as a PairWARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm, and Diisononyl Phthalate (DINP) which is known to the State of California to cause cancer, and ARSENIC which is known to the State of California to cause cancer or other reproductive harm. For more information go to P65Warnings.ca.gov.This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.