The Northern Pipe Products Inc. unique coupling design originated from years of research and the integration of designs from the United States, Canada and Europe. As a result, our design engineers have developed a product that now gives the customer a bell and spigot that easily interlocks without the need for external couplers.

The Northern Pipe Products Inc. Dual Wall advantage doesn't stop there. Every piece of Dual Wall includes a gasket that meets all ASTM F-477 standards. While other manufacturers may charge for this feature, Northern Pipe Products Inc. provides it as standard equipment.

Our pipe and gasket system provides you with a sealed, watertight joint every time. The strength of our rib design and its sleek, smooth interior creates a strong, durable product while our exceptional inner wall allows for maximum hydraulic flow.