Speedline Cavity Closer XPS is a UPVC cavity closer with an insulated XPS core suitable for 50mm to 250mm cavity widths.EconomicComplies with new Part L Building RegulationsInsulated XPS coreStandard cavity widths available are detailed below and other widths are available on request XPS DimensionsCheck and Flush Reveals Speedline XPS can be used as a former to openings and built in whilst the brickwork is being erected but as the exposed insulation edge can be easily cut along the length it is ideal for retro fi t cavities that vary due to brick and block installation tolerances making it a more economical solution.