The SnapLock repair system from Ratech Electronics is a no-dig repair system that renovates the defective section of a sewer or pipe. No chemicals are needed to install. It is the most economical and efficient system for the quick repair of damaged areas in a pipe whose overall condition makes evacuation and the whole relining unnecessarily expensive. Made of high-grade stainless steel and surrounded by a rubber outer sleeve, the snap-lock system is durable and resistant to most chemicals including hydrogen sulfide. It is available in various diameters and lengths. 800/461-9200; www.ratech-electronics.com.