Meritor Inc.'s aftermarket business offers heavy-duty truck and trailer oil-bath wheel seals. The wheel seals feature a wide-seal band, a multi-zone labyrinth design, unique low-friction bumpers, plus the industry's thickest steel casing (0.07") that helps prevent installation damage. The standard model is manufactured to exacting engineering standards set by Meritor from nitrile rubber, also known as NBR, while the premium model uses hydrogenated nitrile rubber or HNBR. The premium model is compatible with all lubricants, including synthetics. The warranty is one year or 150,000 miles for the standard model, and two years or 300,000 miles for the premium model.