Vacuum Suction Cup Level Compensators Spring Loaded Vacuum Cup Suspension Assemblies SLSA-3 Series (1/4″-18 NPT Thread) Part Number: SLSA-399 Part No. Connection Thread Size Travel in. (mm) Height in. (mm) Required Panel Hole Dia. in. (mm) Maximum Panel Thickness in. (mm) SLSA-399 1/4″ 18 NPT 4.75 (120) 8.00 (203) 3/4 (20) 0.70 (18 mm)