... ppr and brass 2, pressure rating:2.5mpa 3, color: white, green, grey, blue 4, size:20mm PPR stop valve Material:Polypropylene ... are a new generation of environment-friendly construction materials developed in the 1990s.Besides plastic tubesmerits such as lightness, corrosion ... , heating pipes, circulation system of hot water, pipes in agriculture, planting in gardens and parks and ranches, etc. 1, raw ...