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Suction Cups..Packet of (4) 52mm (just over 2") suction cup with M4 screw (10mm) with separate ridged nut, standard cup, sucker, suckers, plain, clear vinyl PVC suction cup with screw. : Amazon.co.uk:
RS PRO Suction Cup Hook x 10 | RS
18mm Bellows NBR Black Vacuum Suction Cup G 1/8 inch Female Stroke 8mm | Tameson.co.uk