- COMPATIBILITY: This Black Blender Jar Bottom Cap Base is designed specifically for Standard Oster Classic Duralast Blenders. Ensure a perfect fit with motor bases that have an opening of 3 3/8 inches and external blade base diameters of 2 5/8 inches. Please note that this replacement is not compatible with Pro, Master, or Versa models. - BLENDER JAR BASE REPLACEMENT: Constructed from high-quality materials, this base cap serves as a reliable replacement for Part # 4902. The durable plastic gear and included gasket keep your ingredients securely within the glass or plastic blender jar, preventing leaks and ensuring mess-free blending. - SILICONE RUBBER O-RING GASKET: The included silicone rubber gasket is built to last, providing excellent elasticity for a strong seal. A common issue with older blenders is gasket wear and tear; this replacement ensures your blending experience remains seamless and efficient. - BLENDER REPLACEMENT BLADES: Featuring stainless steel ice-crushing blades that replace original Part # 4961, these sharp blades are engineered to thoroughly crush ice and blend ingredients to a consistent, smooth texture. The design allows the motor to alternate blade directions, effectively drawing food and ice downward for optimal blending results. Use Scenarios: - Perfect for making smoothies by blending various fruits and vegetables without any leakage, thanks to the reliable cap and gasket. - Ideal for preparing frozen drinks or cocktails, as the ice-crushing blades ensure that large ice pieces are broken down into a fine consistency. - Convenient for daily meal prep, allowing for easy transitions from blending soups to sauces while keeping your blender clean and fully functional.