In both 3750 and 4000 series vans the 1/2″ x 4″ Galv Pipe Nipple is used as in flow and out flow port of the water heater. This pipe nipple features a 1/2 inch Male Pipe Thread (MPT) connection on both ends, making it ideal for connecting two female-threaded pipes or fittings. Constructed from galvanized steel, this pipe nipple is designed to resist corrosion and rust, ensuring longevity and reliability in both residential and commercial settings. The galvanized coating also makes it suitable for use in potable water systems, as it complies with NSF 372 lead-free requirements.