RACI, the leader in casing spacer technology since 1952, offers uniquely engineered patented casing spacers certified ISO 9002. RACI Casing Spacers are the number one choice of specifiers and installers to isolate water, sewer and gas pipelines from casings (concrete, PVC or steel). raci Casing Spacers are manufactured entirely out of high density polyethylene with no metal bolts or attachments, 4 product size groups of spacers offer a selection that will provide constant projections around the entire circumference of the carrier pipes of 1½” thru 140” size, with varying support heights available, that allow the spacer to clear bell joints, flanges, couplings and other jointing methods.