Page 1 / 2 Widespread Corrugated Pipe Application We can find corrugated pipes in PE or formed by the HDPE layer. Both of them can be welded by the WELDY extrusion welder type booster EX2 Connection System This pipe system provides different connecting method to match the various demands of reliable sealing and convenient installation preferably. The pipe has many properties relative to other plastic drain pipe, such as reliable water sealing, long service life, flexible and earthquake-proof, less weight, easy and fast installation, etc. WELDY booster EX2