Underwater or markerline Nokalon float: airfilled and thick-walled Also good voor making a markerline for safety and swimming water, vandal-proof.        diam.   nett.       kleur   gat.diam.  max depth-mtr
                    cm         buoyancy           cm               1 uur/100 uur
YTF551        20×20    3,25         rood       2,1                 400/200  mtr
YTF446       28×28    6.5            oranje    2,5               1000/700 mtr
YTF714        36×38    17,4          wit          2,9                 800 mtr

because they are airfilled you have to be carefull with cracks, because of pressure-differences, it is possible a buoy collapse!

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