This filter will fit all 2012 new lay-z-spas, for older Lay-Z-Spas, see the PBW5Pair (Bestway 2) filter.
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Measurements - 105mm x 40mm (Hole through middle)
This will fit models 54112 and 54113 with the new pod. Bestway have improved Lay-Z-Spas from 2012 by offering the new built in wall filter featuring these compact filters.
Filter cartridges should be kept clean and in good condition to prevent flow problems and prolong your spa's life.