Robust One-Size liner for professional use. Suitable for ambient, hot water, and steam curing, max. 100°C / 212°F. 1D STEAMLINER 4 mm is approved as part of the Boldan In-House Lining System®. 1D STEAMLINER 4 mm is designed for the installation with the inversion process by air or water and is suitable for ambient, steam, or hot water curing.