These blue collet clips are placed on plastic plumbing pipes in order to indicate that the water inside the pipe is cold.
FloPlast Push Fit Waste Bend Swept - 92.5 Degree x 40mm White
FloPlast Push Fit Waste Bend Swept - 92.5 Degree x 40mm Grey
FloPlast Push Fit Waste Tee - 40mm White
FloPlast Push Fit Waste Pipe - 50mm x 3mtr Grey
FloPlast Push Fit Waste Bend Swivel - 90 Degree x 40mm Black
FloPlast Multi Fit Compression Waste Bend - 135 Degree x 40mm