Major product categories include line sets copper tube copper fittings valves brass and malleable fittings PEX tube fittings and tools water and gas connectors and appliance kits. Flare X 1/4 in. D MPT Brass 90 Degree Elbow JMFÆs global-sourcing capabilities have been developed over decades providing customers with the best products in the market from the world's best manufacturers. rough plumbing and HVAC wholesale supply industry.