Vacuum Suction Cup Level CompensatorsSpring Loaded Vacuum Cup Suspension Assemblies SLSA-3 Series (1/4″-18 NPT Thread) Part Number: SLSA-370 Part No. Connection Thread Size Travel in. (mm) Height in. (mm) Required Panel Hole Dia. in. (mm) Maximum Panel Thickness in. (mm) SLSA-370 1/4″ 18 NPT 3.10 (79) 6.00 (152) 3/4 (20) 0.70 (18 mm)