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The Waterway 400-4030 union assembly is designed for compatible plumbing applications using a 1-1/2 inch slip connection and a 1-1/2 inch male pipe thread outlet
or no longer delivers consistent performance
Fits SP1090
Hayward Trimline 2-port ball valve
Filbur FC-9890 Pool 18" x 17-3/4" Rectangular DE Grid Filter skimmers The Waterway 400-4030 union assemblyA rectangular DE grid filter helps form the filtration surface inside a compatible diatomaceous earth filter system, and this Filbur FC 9890 grid is designed in an 18 inch by 17 3 4 inch format for matching pool applications. When the original grid becomes damaged or worn, the filter can lose the dependable debris capture support it should provide. The 18 inch by 17 3 4 inch dimensions and FC 9890 reference give this part practical value because DE
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