KELEN PP-RCT SENSO Polyfusion welding fitting for connecting pipes with fittings made of the same material (no reduction of internal diameter) and a factory-installed 4mm soft-foam insulation, free from halogenated or partially halogenated blowing agents and hexabromocyclododecane (HBCD), can be located electronically, outside layer consisting of woven tape fabric and viscoplastic polymer alloy