2 handles on each side Ground nstruction mats 2’*4′ for Sep 01, 2003 · These rules address pipe sizing, installation, pipe material, erosion protection, and maintenance. Rule 1. Use a Pipe No Smaller Than 18-In. large pattern ground access mats 12.7mm thick for parit The tough 12.7mm thick polyurethane mats don’t HENAN OKAYorb heat when