PERFECT FIT - Aluminum diesel fuel tank cap & DEF cap are compatible with 2019 2020 2021 2022 2023 2024 Ram NEW Models, NOT for 2019 Ram 3500 (There will be three vertical guideposts in the fuel neck. NOT Come With the tether for DEF cap.) GOOD SEALING TO AVOID COSTLY REPAIRS - The edges of the diesel gas cap and DEF cap are covered with rubber rings to ensure airtightness, and the on/off design locks the tank, effectively preventing dust, and debris from getting into the tank HANDLE DESIGN, EASY TO GRIP - A diesel gas cap with a handle allows you to easily put in and take out the diesel fuel tank cap, even in a narrow space using 2 fingers FLAPPER VALVE WILL NOT BE PUSHED DOWN - The diesel gas cap is pre-grooved for the flapper valve and will not be pushed down to prevent the flapper valve from closing. Seals well and avoids costly repairs ADDITIONAL GIFT: DIESEL GAS CAP HOLDER - Use a gas cap holder that won't loosen over time like a magnet hold PERFECT FIT - Aluminum diesel fuel tank cap & DEF cap are compatible with 2019 2020 2021 2022 2023 2024 Ram NEW Models (There will be three vertical guideposts in the fuel neck. NOT Come With the tether for DEF cap.) GOOD SEALING TO AVOID COSTLY REPAIRS - The edges of the diesel gas cap and DEF cap are covered with rubber rings to ensure airtightness, and the on/off design locks the tank, effectively preventing dust, and debris from getting into the tank HANDLE DESIGN, EASY TO GRIP - A diesel gas cap with a handle allows you to easily put in and take out the diesel fuel tank cap, even in a narrow space using 2 fingers FLAPPER VALVE WILL NOT BE PUSHED DOWN - The diesel gas cap is pre-grooved for the flapper valve and will not be pushed down to prevent the flapper valve from closing. Seals well and avoids costly repairs ADDITIONAL GIFT: DIESEL GAS CAP HOLDER - Use a gas cap holder that won't loosen over time like a magnet hold