Check the listing for details. TapeTech Mudrunner Replacement Threaded Gas Spring (149020). Condition: New. Listed at 69.99 USD. TapeTech Mudrunner Replacement Threaded Gas Spring This is a replacement TapeTech Mudrunner™ threaded gas spring. They do go bad over time. So if your Mudrunner is not pushing out as much mud as it used to, it may be time to replace this piece. Includes: TapeTech Threaded Gas Spring Spring #149020 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 service all major brands. 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. Al's Taping Tools & Spray Equipment815 Tower DriveMedina, MN 55340