The part number 1304030 refers to a 45" snowplow angling pressure hose with a 90° swivel elbow and a 1/4" quick coupler, manufactured by Buyers Products. This hydraulic hose is a direct replacement for Meyer and Diamond plow pumps, specifically designed to withstand up to 2750 PSI. It plays a crucial role in the hydraulic system of snowplows, allowing for efficient angling of the blade during snow removal operations.