I have ordered two sets of Karbay: at the moment THREE out of four membranes have broken in just four months! The magnets/housing/etc. my OEM pump are either new or good; The problem is that this Karbay rubber seems to be too stiff/stretchy and therefore can't seem to handle the constant flexing required as it always breaks around the OD of the inner plastic bushing. By the way, the previous OEM Hiblow membranes lasted six years.
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