Clesse Compact TR800 Auto Changeover Valve with OPSO & Galvanised Pigtails (POL) The Clesse Compact TR800 Automatic Changeover Propane Gas Regulator Kit (POL) gives you safe, reliable and uninterrupted propane supply by automatically switching between cylinders when one runs out. With its compact design and high-performance safety features it’s perfect for residential, commercial and off-grid LPG systems. This kit includes a TR800 automatic changeover regulator, two 20-inch high-pressure POL pigtails with excess flow and non-return valves, a mounting bracket, and a full-bore EN331 MOP5 butterfly ball valve with test point for easy and secure installation.