Vacuum Suction Cup Level CompensatorsSpring Loaded Vacuum Cup Suspension Assemblies SLSA-3 Series (1/4″-18 NPT Thread) Part Number: SLSA-330 Part No. Connection Thread Size Travel in. (mm) Height in. (mm) Required Panel Hole Dia. in. (mm) Maximum Panel Thickness in. (mm) SLSA-330 1/4″ 18 NPT 1.94 (49) 4.00 (102) 3/4 (20) 0.70 (18 mm)