B series door closer have three power level: B2、B3、B4 Each power level have optional (w) and (d) in same dimension Dual valve, closing and latching speed controlled by two separate regulating valves. The model with (d) can keep opening while...
Applications : High quality oil seal, preventing oil leakage. High quality Aluminium-Alloy die casting. Can be used for all metal, Steel & plastic door....