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Used in Pentair Purex 'QuietFlo' & 'Aquatron' pumps with 5/8 inch shafts.
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Choose Good (Graphitic plastic), Better (Viton) or Best (Silicon Carbide)
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Use small amount of silicone grease to help seat seal rubber.
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MFG #s PS-501, 501, 5063-15, 5250-
1212, PS-1903, PS-3864, PS1903, PS3864, PS501, VG- 501