Farm Duty belt rated for vacuum pumps AXS34 36" x 1/2" Gates Hi-Power® II belts have concave sidewalls to distribute wear evenly while providing proper belt support for improved service life. Flex-bonded cords and Flex-Weave® covers make them the No. 1 choice for heavy-duty conventional V-belt drives. Resists the effects of oil, heat, ozone, sunlight, weather and aging. Superior length stability means less tensioning and take-up during service.