Hayward Standpipe and Underdrain Assembly | VLX4001A Uxmal AutoPilot Complete System Comparison

AutoPilot Complete System Comparison

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Hayward Standpipe and Underdrain Assembly | VLX4001A Uxmal AutoPilot Complete System ComparisonWhat 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