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PE : Polyethelyne EF : Electric Fusion BW : Butt Welding
https://www.zzfittings.com/stainless-steel-fitting-suppliers/
For PE Piping systems On EF (Electrofusion) you will use an electro-wired fittings and electrofusion machine while in BW - Butt weld, you will use a non-wired fittings wh ... Voir Plus