NingBo Sanzhuang Valves CO.,Ltd. Was Founded in 1980 and our company is specialized in producing lpg pressures regulator,lpg bottle valves,aluminum-plastic composite,copper fitting and quick close fittings. Over the past twenty five years, our company amplifies management system and continuously expands capability .now there is a team of competent technicians and skilled workers and they keep improving and continous to develop new products to base on market demand. Our company wins hon...