Tweetop pre-insulated MLCP (Multilayer Composite Pipe) is a durable, flexible, and energy-efficient solution for heating and plumbing systems, featuring a PERT-AL-PERT construction and pre-sleeved insulation for easy installation. It is available from various online retailers in multiple sizes and coil lengths. 
Key Features and Benefits
High Flexibility: The pipes are highly flexible, allowing for a small bending radius which simplifies installation, even in intricate layouts or tight spaces.
Thermal Stability: They have a low thermal expansion coefficient, similar to metal pipes (0.025mm/mK), which minimizes movement and expansion-related issues within the system.
Oxygen Diffusion Resistance: A full aluminum core acts as an oxygen barrier, preventing system corrosion and protecting the longevity of heating installations.
Durability and Reliability: Constructed with an ultrasonically welded aluminum core surrounded by layers of raised temperature polyethylene (PERT), the pipe is designed to withstand pressures up to 10 bar and temperatures up to 95°C, with an estimated lifespan of at least 50 years.
WRAS Approved: The pipe is approved by WRAS (Water Regulations Advisory Scheme) for use in potable water installations, ensuring compliance with UK safety standards.
Pre-sleeved Insulation: Comes with 9mm red or blue insulation pre-applied, which aids in pipe identification (flow and return) and provides thermal protection, reducing heat loss and saving labor costs on site.
Energy Efficiency: Low-pressure losses and low thermal conductivity contribute to energy savings.