Poolmaster 27400 13" Air Relief Vinyl Liner Vacuum. Poolmaster’s Classic Collection offers a generous selection of performance and built-to-last products made from resilient components designed to keep your pool sparkling. For vinyl liner and fiberglass pools, the Air Relief Vinyl Liner Vacuum features a stainless steel tension spring handle which aids in keeping the vacuum submerged and level to the pool floor. Two self-adjusting air relief valves help control the amount of suction created by the vacuum. The swivel-function hose adaptor helps in maintaining kink-free cleaning operation. The Air Relief Vinyl Liner Vacuum can work with 1.25″ and 1.5″ vacuum hoses.