Check Valves - 14mm OD. 54mm length, 2.8mm air hole dia.For aquarium, put the check valve in the air hose to prevent the water from flowing into the air pump
High&Low Temperature Resistance - Operating Temperature of silicone tube is -60°C to 240°C(-76°F to +464°F)
Good Transparency - Our silicone tube is of high grade of transparency that easy to observe liquid flow.
Widely Application - for aquarium, air pump, fish tank, air flow control levers, etc.Great for use with aquarium ornaments and many filters.