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For sale is ONE Wyco cap. It comes with the spongy filter inside. It was never used, though it has some handling related scratches of minor nature. No cracks.
Also included are 10 matching nylon bolts 1/4-20 NF thread. These are the ones to use to attach these caps. Do not use steel bolts, as that would defeat double insulation of Wyco vibrators. You need only 4, but I will give you 10 just in case.
They should fit on many Wyco vibrators like model 993, 991 etc.