The USA Lab Tri-Clamp Hemispherical Lids are equipped with 4 x 1/2" compression ports. These Hemi Lids come with various Tri-Clamp sizes depending on size selection of your lid. These lids allow for maximum customization. Hemispherical Lid with 1/2” Compression Specifications:SKUHLC-6HLC-8HLC-12Base6" Tri-Clamp8" Tri-Clamp12" Tri-ClampTri-Clamp Ports3x 1.5" TC3x 2" TC(2x 2" TC) + (1x 3" TC Center)Compression Ports4x 1/2" Compression4x 1/2" Compression4x 1/2" Compression    For Technical Support, Questions, or Other Issues Please Email or Call Us!