ASHP External Trunking Pipework and insulation running from an air source heat pump should be protected. Our range of trunking comes in a 140mm width and accommodates both the insulated flow and return pipework along with any associated cabling. Features: • Easy to install • 140mm width accommodates both the insulated flow and return pipework and other associated cabling • Proves a professional and neat finish • Made from high grade fade resistant PVC • Protection from the elements, accidental damage and pest damage