Tubeless Clamp in tire valve Cold, Heat and Ozone Resistant Tubeless Clamp in tire valve Our company was established twelve years ago as Ningbo Zhongda Valve Wick Co.,Ltd. Which is a small craft-based firm specialised in tire valves and valve cores purely for use in the automotive sector. However, in 2004 the decision was made not only to increase and diversify the former traditional activity, ...