Unidelta fittings for butt welding are made of PE100–MRS 10–Sigma 80 high-density polyethylene. They are highly resistant to chemical agents and UV light, and are completely non-toxic as they are designed for conveying drinking water.

They are approved for conveying Series S5 - SDR11 gas and water and fluids at pressures up to PN16.

Diameters range from 25 mm to 315 mm .

Welding should be performed with a heating element by contact (UNI 10520) or by electrofusion (UNI 10521).