Hayward VLX4003A Multiport Valve

What This Part Is Used For
The Hayward VLX4003A is a multiport valve used on compatible Hayward VL Series top mount sand filter systems. It mounts on the filter and directs water through different functions like filtration and backwashing based on handle position. This valve sits at the top of the sand filter on the equipment pad.

Why This Part Matters
A worn or leaking multiport valve can cause water loss, poor filtration, or bypass that keeps the pool from clearing up. If the valve does not shift cleanly, backwashing becomes unreliable and the filter can clog faster. Replacing the valve restores correct flow routing and makes routine maintenance predictable. Using the correct valve prevents plumbing mismatch and sealing issues.

Key Features and Specifications

• Manufacturer part number: VLX4003A
• Multiport valve for compatible Hayward VL Series sand filters
• Top mount valve application
• Directs flow for common sand filter operating modes
• Installs on the equipment pad at the top of the filter

Installation and Fitment Guidance
Always shut off the pump before moving or servicing a multiport valve and relieve filter pressure first. Confirm all connections and seals are properly seated before restarting circulation. Confirm by manufacturer part number before ordering.

About the Hayward Brand
Hayward produces a complete pool equipment ecosystem including pumps, filters, heaters, automation systems, cleaners, salt chlorination, and service parts. Their sand filters and valves are commonly paired with Hayward pumps for stable circulation and easy service. This compatibility simplifies equipment pad upgrades and troubleshooting. Hayward replacement valves are widely used in residential pool service.

Common Service Context
Techs usually replace a multiport valve when it starts leaking at the handle area, drips at the body seam, or will not backwash properly. It is often identified when the pool stays cloudy despite clean pressure readings or when water returns to the pool during backwash cycles.