By Waterway
Part # 4742-141
Manufacturer Code 502-2111
Dimensions 7" L x 7" W x 2.75" D
Alternate Part #'s 502-2011, 5022011, 31-270-1212, WW5022011
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Is this drain screen cap needed what does it do?, Does it stay inside the filter all the time?
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Part number 502-2111 is what is called a Sand Fill Guide. That piece is ment to stay inside since it also helps keep the standpipe and laterals centered at all times.
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