Vacuum Cups and Suction Cups Model: Universal Flat Series Part Number: F3-SI (Silicone) Vacuum Cup/ Suction Cup No. Flared Overall Dia. D Overall Dia. d Fitting Dia. H Static Height Load Capacity* at 24 in. Hg (609.6mm Hg) [2:1 Safety Factor] Recommended Fitting (Click for Info) Suspension Group for Cups F3-SI (Silicone) 0.14 in. (3.6 mm) 0.12 in. (3.0 mm) 0.05 in. (1.3 mm) 0.28 in. (7 mm) 20 grams