These collars can be installed in seconds without need to drain down or disconnect. You can do it. Suitable for standard 20mm pipe. Collars will cover and hide a hole up to 110x65mm. Pipe holes are fully rotatable, which means that cover will fit all double pipe installations with the gap between 5 and 55mm. Very easy to split-clip on. Specifications: - Material: white PVC; - Length: 113mm; - Width: 68mm; - Outter hole size: 45mm; - Inner hole size: 28mm.