The Waterco HRV 18 collector assembly is designed for compatible sand filter applications where the central internal collection section needs replacement. A collector assembly is useful because it serves as one of the key internal structures that works with laterals and related parts to manage water movement through the filter bed.This replacement is especially useful when the original collector is cracked, worn, or too compromised to continue building around with confidence. Replacing the collector assembly can often create a much more complete and dependable rebuild than trying to salvage weakened internal parts one by one.The HRV18-COL is a practical service part when a compatible Waterco HRV 18 filter needs its internal collector structure restored for cleaner and more reliable operation. Waterco HRV 18 collector assembly Designed for compatible internal sand filter restoration Helps restore proper internal water collection and distribution Useful when the original collector is cracked or worn Supports a more complete filter rebuild