Traditionally, end seals were made of brick. But as plastic and rubber technology has evolved, the preferred material for end seals has been EPDM rubber that expands and contracts to ambient temperatures and doesn’t crack and fail as brick and mortar is apt to do. Casings are used for underground placement of carrier pipe beneath highways and other roads, railroads, and through commercial and residential areas. End seals are a cost-effective solution to keep water and foreign material from getting between the casing and carrier pipes.
Casing spacers prevent corrosion by insulating the carrier pipe from the casing. They also eliminate the need to blow sand into the annulus between the pipes, and are easier to attach and slide into place than are wood skids. By eliminating the inner fill, the casing and carrier pipes can be repaired easily or removed later, lowering installation and maintenance costs. These spacers are corrosion resistant and require no special tools or grease for installation; they are simply bolted on and secured to the casing.