Use this iOptron Tri-Pier Adapter to attach your Astro-Physics 400, 600E, or Mach1GOTO mounts onto their Tri-Pier support system. This is the adapter only and is offered here without the mount or Tri-Pier. To protect your instrument make sure the load capacity of the Tri-Pier can handle the total weight of your optical tube, mount, accessories, and other gear like guide scopes and imaging systems before use.