5/16“ Aluminum Line Splice Repair Kit (800-643) by Dorman®. Splice Size: 5/16“. 1 Kit in Card Package. Fitting Size End 1: 5/16“. Fitting Size End 2: 5/16“. Fitting Angle: Straight. Fitting Attachment End 1: Compression. Fitting Attachment End 2: Compression. Material: Aluminum. A lasting, easy and affordable repair solution. Dorman’s A/C Line Splice provides durable on-vehicle or on-site joining of aluminum Lines.