Suitable for 16mm outer diameter, 12mm inner diameter pipes compatible with PERT and compatible with PEX underfloor heating pipes. Durable Material: Made from nickel-plated copper, providing corrosion resistance and long-lasting performance. Precise Dimensions: Each coupler measures 16×16mm, ensuring secure and leak-free connections between pipes. Easy Installation: Simple push-fit design allows quick assembly without special tools, ideal for DIY or professional use. Package Includes: 2pcs pipe couplers, suitable for repair, replacement, or system extension., Manufacturer: Be In Your Mind