NLS 30075 | 20mm PVC Coupling Plain Grey | TC20 The NLS 30075 is a 20mm PVC Coupling designed to securely join two pieces of PVC conduit or pipe together. Couplings play a crucial role in conduit installations by allowing the connection of conduit segments, ensuring proper cable protection and management. With its plain-to-plain design, it can be used with both rigid and corrugated conduit types. The coupling's durable PVC construction ensures longevity and reliability in conduit installations. It can be permanently secured using PVC glue, available in either blue or clear variants. This coupling is a versatile accessory for maintaining the integrity of conduit runs and cable pathways.