NORMA® Compression fittings are made of polypropylene for high-and low density polyethylene tubing, diameters 16 to 110. Maximum service pressure: PN 16 bar from diameter 16 to diameter 63 – PN 12.5 bar from diameter 75 to diameter 110. DOES NOT INCLUDE hot water application. NORMA products are made in factories certified under ISO 9001Version 2008. NORMA® fittings are tested and approved according to these standards: ISO 14236 (Czech Republic). ITC (Poland): BS Standard 5114, AS / NZ 4129, AS 4020. These products are not certified as compliant with international sanitary regulations for transport of potable water and liquid foods.