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4 inches long clear plastic tube with rubber endcaps. Flat, hard rubber piece inside. : r/whatisthisthing
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Prestige Import Group - 4" x 12.25" Transparent Clear Plastic (PETG) Storage Tubes with Red Lid - 4 Pack
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PATIKIL Clear Rigid Tube Round Plastic Tubing with Red Rubber Caps Polycarbonate Water Pipe, 305mm/ 12 Inch Length, 16mmx20mm/0.63"x0.8", 2 Set
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