Gilmer Drive Belts & Pulleys > Products These 1" x 3/8" pitch Gilmer belts are standardized sizing for any belt driven external/dry sump pump application. They are listed by length and are offered as replacements. These hard coat anodized pulleys have a .625" shaft diameter for the dry sump pump and come in 1" and 11/2" widths. The crank pulleys come standard in 1" ID x 1 1/16 " widths. Drive Belts Part No. Application 6670 18.7" Gilmer Drive Belt 6671 21.0" Gilmer Drive Belt 6672 22.5" Gilmer Drive Belt 6673 24.0" Gilmer Drive Belt 6674 24.3" Gilmer Drive Belt 6675 25.5" Gilmer Drive Belt 6676 27.0" Gilmer Drive Belt 6677 28.5" Gilmer Drive Belt 6678 30.0" Gilmer Drive Belt Drive Pulleys Crank Part No. Application 6682 16 tooth crank pulleys 1" ID 6683 17 tooth crank pulleys 1" ID 6684 18 tooth crank pulleys 1" ID 6685 19 tooth crank pulleys 1" ID Pump 6690 26 tooth pump pulleys 1" wide 6691 28 tooth pump pulleys 1" wide 6692 30 tooth pump pulleys 1" wide 6693 32 tooth pump pulleys 1" wide 6695 28 tooth pump pulleys 1 1/2" wide 6696 30 tooth pump pulleys 1 1/2" wide 6697 32 tooth pump pulleys 1 1/2" wide Joe’s Tech: Use the charts provided on the opposite page to determine correct belt length for your application.