My O ring broke as well but I put a drain fitting in the end as my cup is hard to get out with gunk in it. The drain stops it from going down to far.
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150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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