．Multi-ribs of insulator eliminate flashover.
．Insulator made of 95% pure alumina, strong resistant to heat shock, great mechanic and electric features, super insulation.
．Nickel-plated housing prevents oxidation and corrosion; heat-crimping process ensures absolute gas-tight fit.
．Inner sealing with conductive glass ensures a fine conductivity and sealing.
．Multi-layer gaskets are elastically strong, and reliable in sealing.
． Copper core electrode prevents oxidation and corrosion, good electric and heat conductivity, long service life.