PE fittings(electro/butt fusion : coupler, cap, elbow, flange, stub end, reducer, tapping saddle, water pot, tee and ball valve. There are two series: electro fusion fittings and butt fusion fittings.The fittings are applied in gas, oil and water systems.They have the following advantages:1. High air-tightness2. Anti-corrosion3. Easy installation4. Low cost5. Long service life