Are you looking for a professional, yet affordable boston valve? Are you in search of a sturdy, trustworthy tool that can do multiple jobs at once? If yes, look no further Our professional boston must meet you needs. It is one of the best choices for you. Features - Color: Black. - Size: 4x4x4.5cm - Material: TPU. - Diameter: 22mm - Made of material for lasting use. - Standard replacement Boston valve, suitable for most kayaks, inflatable boat, raft, rubber dinghy, etc. - Easy to fit, good performance and long serve life - Spiral design ensures anti-leak inflation. - The rubber pad at the bottom of the will automatically fit the of the air plug after you finishing the inflation. Tighten the lid on the nut plug to stop leakage more effectively.