The AO Smith 100110763 K Orifice is a replacement part made of brass, designed for use in WATER HEATER equipment and parts. It features a 3/8" hex size and comes with a gasket for easy installation. This particular orifice is a natural brass finish and has a number 32 marking. It is a reliable choice for maintaining and repairing your HEATER system, providing a durable and high-quality component for your pool or spa.