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Red Filters from Surplus Shed
Get back to Andre or Fred at Surplus Shed, you may be able to return it.
The one you want is the RED filter from the M9014 filter set (M2) I bought mine alone for $5. ( My o/n 45866)
It fits nicely into a 4" PVC pipe end cap, just cut/ dremmel a 100mm dia aperture for a neat holder.
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