①. Premium ABS Material: These boston air valve is made of thicken ABS material, durable, odorless, lightweight, portable, anti-rust, anti-corrosion and not easy to age, can be used for a long time.<br> ②. Anti-leakage Design: The bottom of our spiral air plugs has an air cushion design to prevent air leakage, which can be perfectly fitted to prevent air leakage. Provide protection for your safety.<br> ③. Ideal Valve Replacement: The anti-leakage air valve bungs is an ideal economical choice for replace the air valve. The size of the screw plug mouth is 20-22 mm, **please confirm the size before purchase.<br> ④. Quickly Inflate Deflate: Easy to use, you can inflate and deflate quickly (one-way inflation) just by placing the inflatable boat air valve on the inflation port, providing you with a convenient life.<br> ⑤. Wide Application: The boston spiral air plugs are suitable for most rubber dinghy, hot tub, airbeds, inflatable boat, raft, etc. The boston air valve is an essential accessories for water lovers!