Irrigation Valve Installation from Mainline to Lateral Lines with Commentary This video shows a full irrigation valve manifold installation using Hunter 1 “ PGVs from mainline to lateral lines from beginning to end. This installation uses a Hunter model PGV-100G irrigation control valve and PVC pipe. A valve manifold installation has many points of possible failure, so Gregg walks you through best practices for Teflon tape, for threaded pipe, cutting pipe, de-burring, cement fusion (commonly called gluing), wire connections, back fill, and designing for maintenance and repairs. A proper valve manifold installation is key to a proper running irrigation system.