Think Crucial Replacement for Oster Blender Jar Base Cap, Compatible With Part # 4902 EASY TO INSTALL because it fits most Oster blenders, Osterizers & Oster Kitchen Centers perfectly and is the same as part # 4902 allowing you to get back to blending anything you'd like! EXTREMELY DURABLE so that you can use your blender without worrying about having to replace the bottom cap over and over again! HIGH QUALITY because that is all we offer here at Think Crucial. This Oster replacement blender jar base cap is guaranteed to make you a satisfied customer! WORKS LIKE A CHARM because who doesn't want a bottom base cap for their blender that works well! Keep your blended goodies in the blender where they belong! GUARANTEED SATISFACTION because of a 30 day full money bank guarantee and a trusted Think Crucial warranty. We are so confident in our products that we have no problem giving you every penny back if you're unhappy with your purchase. You won't see promises like that from big box brands!