40mm Black Corrugated Flexible PVC Pond Hose is a type of flexible tubing that is specifically designed for use in pond and water garden applications. It has an outer diameter of 40mm (approximately 1.5 inches) which is a common size for connecting various equipment and components in a pond or water feature system. This size is ideal for large ponds or water features, and for high water flow.

It is made from a durable PVC material that is resistant to kinking, cracking, and UV damage. The hose is black in color and has a corrugated exterior, which gives it added flexibility and makes it easier to route through tight spaces. The corrugated design also provides a larger surface area for water flow and better flexibility. It is typically used for connecting filters, pumps, and other equipment in a pond or water feature, as well as for creating waterfalls and streams. It is also commonly used in aquaculture and fish farming.

The 40mm size is typically used for high water flow applications and it's suitable for connecting high flow rate equipment such as large pumps and filters, or for creating waterfalls and streams. The hose is UV resistant ensuring long-term durability in outdoor pond environments. The hose can be connected to other hoses or equipment using fittings, and it can be cut to the desired length. It's also easy to clean and maintain, which is an added advantage for maintaining water quality in pond and water garden environments.