Loctite 554 provides maximum solvent resistance on threaded fittings and pipe up to 50 mm (2 Inch) in diameter. It is recommended for refrigeration systems and service with strong chemicals. The sealant is used in place of specialty non-hardening compounds, litharge, glycerine and sealing tape. This product is not for slip fitted tube joints. This product is typically used in applications up to 149 °C.