304 Stainless filter disc, fine mesh fits standard ferrules and standard silicon gasket.
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These simple (low cost) discs are perfect to use under my 500mm 4" packing section. Peace of mind about holding my stainless steel scrubbers in place as on there own they are fairly loose.
I can leave everything in place and really give the system a good flush/hose out from the top knowing nothing will fall out or into the plates underneath,