Tri-Clamp Welded Bottom Base Shipping Information: Signature REQUIRED Upon Delivery of this item. Any fees associated with return shipments to our warehouse due to failure to sign for or pick-up order(s) are customer responsibility. These stainless steel welded bottom bases are the standard base for our extraction systems and provide the user with a heavy duty and high capacity way to collect and recovery their extracted material and solvent. Many people will have several of these welded bases set aside to quickly swap out their base on their extractor to reduce the time between system runs. Specifications: Material: 304 Stainless SteelStandard: 3A High PolishConnection Type(s): Tri-ClampWelded Bottom Thickness: 0.25" - 0.50"