The Union Brass 80037 refers to a Hot Water Stem/Valve Assembly (also known as the 1837A-H) used for repairing various Union Brass lavatory and kitchen faucets. It is a solid brass, washer-type stem assembly commonly used in the 47 Series laundry faucets and other standard two-handle models.
The Speakman G03-0215 is an OEM reference number for a hot or cold chrome plated shower stem/spindle assembly used in Speakman two-handle and three-handle tub and shower valves.
Whether you are a professional plumber or a DIY homeowner tackling a bathroom repair, this replacement stem eliminates water waste and restores smooth handle operation without requiring a costly full faucet replacement.