Vacuum Cups and Suction Cups Model: Universal Flat Series Part Number: F4-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 F4-SI (Silicone) 0.18 in. (4.6 mm) 0.16 in. (4.0 mm) 0.05 in. (1.3 mm) 0.28 in. (7 mm) 35 grams