... ,GB Standard 4.Used in gas,water,oil,etc HDPE Electrofusion Reducer FITTINGSSize from dia 25*20mm t0400*315mmWe supply many different ... fittings with wide range, including elbow, coupler ,reducer ,tee ,saddle.and combined electrofusion (electric-melting) series :combined electric-melting knee(elbow),tee ... water, industrial water irrigation systems)Sewage and waste water PE Electrofusion Reducer