Check the listing for details. TapeTech Mud Head Outside 90 Degree Corner Finisher - 16TT. Condition: New. Listed at 89.00 USD. TapeTech Mud Head Outside 90 Degree Inside Corner Applicator TapeTech® Outside 90 Degree Applicator Heads apply a consistent base coat of joint compound for the cleanest and most efficient installation of paper-faced corner bead. Simply attach this head to your corner box, MudRunner of compound tube (sold separately) and run it down the outside 90 corners. It will leave a nice, consistent bed of mud for you to stick your paper-faced corner bead to. TapeTech stands behind their drywall taping tools with a 5 Year Warranty! Fists all major brands of corner boxes, compound tubes / Mudrunner. Al's Taping Tools is the Largest Drywall Tool Store in the World! We are also a fully equipped automatic drywall tool service center with over 30 years in the industry. We sell and service all major brands of automatic drywall tools. All of our service techs are also fully trained in the operation of the tools that we sell and service. So if you are new to automatic drywall tools or have any questions, please give us a call or send us a message. We are here to help. Al's Taping Tools & Spray Equipment815 Tower DriveMedina, MN 55340