Genuine CAT 1R-0750 fuel filter sealed Duramax Caterpillar 1R0750 1r 0750 4 PACK. Genuine CAT 1R0750 filters - Quantity of 4 Thread size (inch): 1-14-2B Height: 181.5mm Diameter: 85.7mm Advanced efficiency 2 micron absolute cellulose media filter. Made in the USA or Czech Republic. Authentic Caterpillar 1R-0750 fuel filter. Don't settle for any other brand! Cellulose media filters particles as small as 2 microns. This filter is commonly used for Duramax diesel fuel filter adapters and conversions. Caterpillar has manufacturing facilities in both the USA, Czech Republic and other locations. Rest assured that this product is genuine.