The most advanced generation Scotseal wheel seal is the preferred choice among many OE truck and trailer manufacturers. The Scotseal PlusXL features an advanced new HNBR (Hydrogenated Nitrile Butadiene Rubber) material that resists wheel end temperatures up to 300º F and offers broad compatibility with synthetic lubricants. Additionally, the ScotsealPlusXL is hand installable, eliminating the need for special size tools.