The openings of this device are too small for efficient use. If you use sealant with particles in the sealant (e.g. Panaracer sealant) then when you glue this block all the goo will go into the tire but the particles intended to fill large holes will stay in the piston. Do not buy this block. Had identical problems with Panaracer sealer and Finishline sealer. This will turn your high quality sealant into junk.
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