What is the minimum number of bands required for no-hub couplings installed underground?

No-hub couplings are commonly used in plumbing and drainage systems to connect pipes securely without the need for hub fittings. When installed underground, these couplings are subject to specific standards and guidelines that ensure their reliability and durability in potentially harsh environmental conditions.

The minimum number of bands required for no-hub couplings installed underground is four. This requirement is established to provide adequate grip and support to the joined pipes, ensuring that they remain secure and leak-free over time. The four bands help distribute stresses evenly across the coupling and create a reliable seal. This is particularly important in underground installations where soil movement, moisture, and other environmental factors may exert additional forces on the pipes.

Utilizing four bands helps to comply with industry standards and ensures that the system can withstand the conditions typically encountered in underground applications, enhancing the overall integrity of the plumbing system.