Primary Pro is the preferred choice for professional heat pump installers when it comes to insulating and sealing external system pipework. The British made insulation not only maximises heat pump efficiency but also enhances the aesthetic appeal of installations, guaranteeing a high-quality finish. The Primary Pro range is 100% waterproof insulation and the very best UV protection. It come in 22mm, 28mm, 35mm & 42mm (bore) by 19mm (wall) in 1 mtr lengths to fit pipework, external fittings including lever and anti-freeze valves. Sealing every joint and gap with the unique Bond & Seal helps to prevent heat loss and moisture ingress along with clipping on the outside of the insulation so there is no thermal transfer of heat, reducing efficiency.