What kind of plumbing system are you installing? Whether commercial or residential, drinking water or natural gas, Viega has everything you need and the certifications to back it up. Viega ProPress Copper and ProPress Stainless 316 carry NSF-61-372 certifications that meet lead-free requirements for domestic water. Viega PureFlow Systems carry NSF-14 certifications for domestic water. Viega MegaPressG is designed specifically for fuel and gas applications. With a proven HNBR sealing element and LC4 certification, you will be sure to find the right solution for your project.