... : Pressure spring Specifications: Pressure spring, commonly used in switches, sockets, water heaters and so on. Model: hs-1 ... Name: Pressure springSpecifications: Pressure spring, commonly used in switches, sockets, water heaters and so on.Set technology research, development ... smart wire, bronze wire, phosphor bronze wire; smart-plated surface treatment, zinc, gold, silver, copper, pot black, epoxy ...