The document describes the Apricus Plumber app, which was created to address issues with plumbing installation through an easy-to-use mobile app. Interviews found that installation errors were often due to a lack of regular training and updated manuals for remote installers. The app provides regularly updated installation manuals and videos to guide plumbers step-by-step. User research showed the navigation should be on the left side for one-handed use and allow pre-downloading content over WiFi for offline access.