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The LOCTITE LOC303420 is a 545 thread sealant formulated for use on hydraulic and pneumatic fittings. It comes in a 10 ml bottle and is designed to seal threaded connections against fluid and gas leakage. The sealant cures in the absence of air when confined between close-fitting metal surfaces, locking and sealing assembled fittings. It is commonly installed by licensed plumbers, HVAC technicians, and hydraulic system mechanics working on metal pipe and fitting assemblies where a reliable, pressure-resistant seal is required.
This sealant is suited for hydraulic and pneumatic fitting applications in both residential and light commercial settings. It works on metal threaded fittings where resistance to hydraulic fluids, pneumatic gases, and system pressures is critical. The 10 ml bottle size is appropriate for field service work and bench repair tasks where controlled application is needed. Technicians use it on fitting assemblies to prevent joint seepage without relying on tape-based thread sealing methods.
Designed as an OEM-style thread sealant for use on hydraulic and pneumatic metal threaded fittings in fluid and gas system assemblies.
Applied by licensed plumbers, HVAC technicians, or hydraulic system mechanics on clean, dry, grease-free threaded metal surfaces. Depressurize and isolate the system completely before disassembling or resealing any fitting. Apply sealant to the male threads only, keeping it away from the first thread to prevent contamination of the system. Allow adequate cure time before returning the assembly to service pressure.
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