Rebuilding a Waterous Transfer Valve requires a basic understanding of mechanical systems and some specialized tools. Here are some general instructions for rebuilding a Waterous Transfer Valve:

1. Turn off the water supply to the valve and relieve any pressure in the system before proceeding.
2. Remove the valve from the vehicle or system and disassemble it carefully, taking note of the orientation and location of each part.
3. Clean all parts thoroughly with a solvent and inspect them for signs of wear, corrosion, or damage. Replace any parts that show signs of wear or damage.
4. Reassemble the valve in the reverse order of disassembly, making sure to use the correct orientation and position for each part.
5. Apply a small amount of lubricant to any moving parts, such as bearings or seals.
6. Test the valve for proper operation by turning on the water supply and checking for leaks or other issues.
7. Reinstall the valve in the vehicle or system and make sure it is properly connected and secured.

It’s important to note that the exact steps for rebuilding a Waterous Transfer Valve can vary depending on the specific model and design of the valve. Therefore, it’s important to refer to the manufacturer’s instructions or seek the guidance of a trained professional if you are uncertain about any aspect of the rebuilding process.