Tuff-Seal™ Threaded Adapters easily convert - or mate - one thread style with another. These adapters are offered with both internal and external threads that mate NPT with metric (or ISO) style fittings or NPT with PG fittings. They are constructed of machined aluminum with electroless nickel plating for enhanced protection against corrosion, friction and contamination. The threaded adapters also incorporate a buna O-ring to provide a liquidtight seal. This product family meets ASTM, MIL and AMS specifications. Custom thread configurations are also available upon request.