Hayward Standpipe and Underdrain Assembly | VLX4001A Fire Pit Using Scale Free helps protect

Using Scale Free helps protect heaters

and advanced electronic or integrated control systems

This weight set is commonly replaced during cleaner tune-ups

As a replacement

Polaris Turbine Wheel with Bearing

Hayward Standpipe and Underdrain Assembly | VLX4001A Fire Pit Using Scale Free helps protectWhat This Part Is Used For The Hayward VLX4001A is a standpipe and underdrain assembly used inside compatible Hayward VL Series sand filters. It manages internal water distribution through the sand bed and supports proper filtration and backwashing. This assembly lives inside the filter tank under the multiport valve connection. Why This Part Matters If the internal underdrain components are cracked or out of position, the filter can bypass sand and