The BK Mueller, and ProLine 9.5" overall length stem is for the 6 inch faucets.

The BK Mueller 888-561 9.5" OAL stem is a plumbing component. Let’s break down the details:

1. Brand and Model: BK Mueller
2. Part Number: 888-561
3. Overall Length (OAL): 9.5 inches
4. Function: This stem is likely used in a faucet or valve assembly. It connects to the handle and controls the flow of water.
5. Material: The stem is typically made of brass or another durable material.
6. Application: It is commonly found in plumbing fixtures such as faucets, shower valves, or outdoor hose bibs.
7. Features: Depending on the specific model, it may have additional features like anti-scald protection, ceramic discs, or replaceable washers.
8. Compatibility: Check the manufacturer’s specifications to ensure compatibility with your specific plumbing system.