1Included: Breastpump accessories include 6 duckbill valves, 2 backflow protectors, 2 silicone tubing and 2 tube adapters for Synergy Gold. Compatible for S2, for S1, for 9 Plus and for M1 breastpumps. 2Compatibility: Our breastpump accessory kit is compatible with duckbill valves, soft tubing, backflow protectors for Synergy Gold pump. Good compatibility is convenient for new moms to use. 3Easy to Install and Remove: The duckbill valve comes with a convenient pull ring so you can easily remove and replace the duckbill valve. It is very convenient for new moms to use on a daily routine. 4Easy to Clean: Wash these replacement breastpump accessories in soapy water and rinse with clean water. Do not use a hard brush. Use your fingers to clean the fine tips. Do not use dishwasher. 5Premium Material: Breastpump accessory is made of premium liquid silicone for secure and reliable quality. Can be cleaned by boiling water. It is very convenient for new moms to clean and maintain on a daily routine. 2 x Disc BackflowValves 2 x Silicone Tubing 2 x Connectors 6 x White Duckbill Valves