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For Hayward Series 1500,1580, 1700, 1591, 1592, 1593 pump models (Power-Flo, Power-Flo LX, Power-Flo II ).
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Specific Hayward threads, inside of union is 1-1/2" slip-glue, outside is threaded.
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MFG #SP1500UNPAK2
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Replaces: 2110-12, 40031, 409078, 5111-27, 610377050357, 610377050364, HAY-45-6067, SP-1500UNPAK2, SP1500UN-PAK1, SP1500UNPAK1