Description
Keep your water bed mattress properly sealed with a replacement Waterbed Cap & Seal set. Also known as a pull cap and plug, this two-piece valve system is designed to secure the fill opening on a waterbed mattress.
The flexible inner plug fits into the valve opening first to block water and air. The threaded outer cap then screws over the valve neck to hold the plug firmly in place during normal mattress movement and body weight pressure.
A secure cap and seal can help reduce the risk of unwanted air entering the mattress and help prevent leaks around the fill valve. It is a practical replacement part for waterbed owners with cracked caps, broken pull tabs, missing plugs, or worn valve closures.
Features
- Replacement cap and seal for waterbed mattress fill valves
- Two-piece design includes inner plug and threaded outer cap
- Flexible plug helps block water and air
- Pull cap screws onto the valve neck for a secure fit
- Helps create an airtight and watertight seal
- Useful for replacing worn, cracked, missing, or damaged valve parts
- Easy hand-tight installation
- Designed for standard waterbed mattress valve assemblies
Installation Tips
- Remove trapped air from the mattress before sealing.
- Press the flexible plug firmly into the valve opening.
- Screw the outer cap on by hand until snug.
- Avoid using pliers or excessive force, which can damage the plastic threads.
- Push the sealed valve down into the mattress cavity so it sits below the surface.
The Waterbed Cap & Seal is a simple, affordable replacement part that helps keep your waterbed mattress secure, sealed, and ready for comfortable use.





