Designed for use with the Mitsubishi Electric Ecodan air to water heat pumps. This set of flexible water pipes part: FH-500-28-F have a braided steel outer core for maximum strength and durability and come pre-insulated. These flexible water pipes allow easy connection to the Mitsubishi Electric Ecodan heat pump unit water in / out water connections. For full deatils please see the brochure below.