Diamond Plastics manufactures 12" thru 36" Corr-21^TM corrugated outer wall PVC sewer pipe in accordance with ASTM F794 Standard Specification for Poly(Vinyl Chloride) (PVC) Profile Gravity Sewer Pipe and Fittings Based on Controlled Inside Diameter and ASTM F949 Standard Specification for Poly(Vinyl Chloride) (PVC) Corrugated Sewer Pipe With a Smooth Interior and Fittings.

These standards contain manufacturing and quality control requirements for gasketed corrugated PVC sewer pipe with a minimum pipe stiffness of 46 psi (equivalent to sdr 35). These standards were published in 1983 and 1985 respectively.

This product provides an engineered wall structure which maintains pipe stiffness while dramatically reducing weight. This means reduced handling and up-front costs. Corr-21 provides the same bottle tight joints, corrosion resistance, strength and flexibility as SDR 35 PVC sewer pipe.

It is also suitable for many low head gravity flow applications for which bottle tight joints and corrosion resistance are desirable. Corr-21^TM is Corrugated Pipe for the 21st Century.