Amazon.com: Beduan Push to Connect Fitting Ball Valve, 6mm Tube OD Pneumatic Air Flow Control Ball Valve Straight Union Connect Adapter : Industrial & Scientific
Amazon.com: SUOFEILAIMU-PHONE CASE Metal Coupler for RC Airplane Model Motor Jaw Steel Shaft Coupling Coupler Rigid for Motor Connector (Inner Diameter : 10mm to 10mm) : Industrial & Scientific
Amazon.com: Addi Click Cords and Connector, Set of 3 : Arts, Crafts & Sewing
KFidFran 4mm to 4mm Bore Rigid Coupling, 20mm Length 9mm Diameter, Copper Shaft Coupler Connector, Brass Tone 2Pcs( Starre Kupplung mit 4 mm bis 4 mm Bohrung, 20 mm Lテ、nge 9 mm