Hayward Standpipe and Underdrain Assembly | VLX4001A Fire Pit It allows attachment to matching

It allows attachment to matching pipe fittings

Proper filtration is essential for water clarity and chemical efficiency

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Hayward Standpipe and Underdrain Assembly | VLX4001A Fire Pit It allows attachment to matchingWhat 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