Cemcast Pipe and Precast manufactures all pipe, arch pipe, and manhole products with a single-offset gasket joint. These gaskets ensure a watertight connection to 13 psi when installed properly. The 13-psi rating is equivalent to a column of water 30’ deep. To achieve such a high psi rating, the single-offset joint is precisely manufactured with minimal annular space for the gasket. When installing manholes, follow the same basic steps detailed in our concrete pipe section to ensure trouble-free watertight connections.
1) Check that the joint surface is clean
Ensure the joint is free of dirt and other foreign debris. If the manhole spigot is not clean, the gasket will not seal properly.
2) Place the gasket on the spigot in the proper direction.
3) Square it up
4) Ensure no gaps and the gaskets are sealed
When the pieces are properly aligned and then mated, push them all the way home. A properly homed joint will not have a gap, ensuring the gasket seals properly.
GASKETS ARE SELF-LUBRICATING
Finally, it’s also important to note that the Hamilton Kent Tylox SuperSeal gasket we supply is self-lubricating and does not require lube or equalization. Following the steps above will ensure a trouble-free installation and a watertight system.