Our Schedule 40 and Schedule 80 IPS pressure pipe is manufactured in accordance with the specifications set forth in ASTM Standard D1785 and is listed with NSF for use in potable water applications, having met Standards 14 and 61 requirements. Our Sch 40 has the advantage of being dual rated, it also meets the requirements of ASTM D2665. National offers a broad range of products to meet any commercial, industrial or residential piping requirements.