Hydrostatic Relief Valve With Collector Tube length_300 Feet They are specifically formulated to

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Hydrostatic Relief Valve With Collector Tube length_300 Feet They are specifically formulated toThe AquaStar Hydrostatic Relief Valve is a self contained unit that helps prevent swimming pool damage due to hydrostatic pressure beneath the pool shell. This valve assembly has a built in collector tube and installs directly into the pool finish with no additional plumbing connection required. Made in the USA, this assembly is an easy solution for preventing hydrostatic pressure damage to your pool.