... pipe, 3MM U type steel galvanized shelf, closed-end pressure regulator.2.Advantage: international Q235 material, Good elasticity, not deformation ... of eggs is zero.3.White PVC trough, full new PVC material, resists compression, heat-resistant, not deformation, ... .Enclosed type compressor governor: the fully closed design, pressure regulating and filtration together, can regulate the water arbitrary ...