Spring Loaded Hydrostatic Relief Valve Relieves the air and water that can build up under pond liners. The hydrostatic relief valve threads into 1-1/2" or 2" bulkhead fittings. A hydrostatic relief valve (commonly referred to as a burp vave) is placed at the bottom of an in-ground pond or swimming pool. Its purpose is to open when excessive ground water pressure builds up allowing the ground water into the pool.
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