TEMCo uninsulated butt splice connectors come in either bare copper or tin-plated copper. No matter your material choice, you're getting a high-quality connector for a variety of applications. With high temperature resistance, a solid copper construction, and flared openings for simple and clean wire insertions, you're bound to find a lasting connection in one of our various sizes: #6, #4, #2, #1, #1/0, #2/0, #3/0, and #4/0. When combined with TEMCo adhesive-lined shrink sleeve, you can prevent corrosion by sealing out moisture.