Ubbink 125mm Insulated 90dg Bend This is insulation from Ubbink that has been designed specifically for a 90 degree bend within a 125mm pipe. By insulating your pipes, you can save on energy costs by ensuring hot water pipes remain warm. Insulation can also help to prevent cold water pipes from freezing during spells of cold weather, and the insulation can also be used on pipes affected by condensation - condensation can lead to damp and mould.