Delivery time to the US, CA, AU is 5-14 working days. This series of replacement reaction kettle flask cover include 3-Neck Cover/4-Neck T-tpye distributed/4-Neck 120°Uniform distributed reaction kettle flask Cover. 1. This product is 4-neck 120°Uniform distributed 34/45-24/40 ground glass Joints reaction cover suitable for KimLab or reaction kettle flask bottom. 2. If you purchase a KimLab replacement reaction bottom and a KimLab reaction cover together,We will give you a matching stainless steel clamp. Cat.NO. Product Name REA-51 KimLab Round Replacemen Reaction Kettle Flask Bottom REA-52 KimLab Cylindrical Flat Bottom Replacement Reaction Kettle Flask Bottom REA-53 KimLab Cylindrical Replacement Reaction Kettle Flask Bottom REA-54 KimLab Double-Layer Replacement Reaction Kettle Flask Bottom