Fits 2020-2025 GMC/CHEVY HD trucks with the Duramax Diesel engines. 
 
This is NOT compatible with the 1500s, earlier model year trucks, or gasoline engine trucks. If you purchase in error, please call to arrange an exchange.

Please review the locking DEF cap in case you need more information.  If you are looking purchase both caps at the same time in a set, please review the Loc-Sure/Spin-Loc Combo for this series.
 
Some customers report difficulty operating the caps. Please call customer service in case this happens to you.
 
 
Each Loc-Sure purchase comes with the Loc-Sure cap and one pair of Secure Keys with complimentary stainless steel key ring. The Loc-Sure has natural venting. Additional keys can be purchased using the information from our Secure Keys page.