You Are Buying Ass Pictured A Anodized Fuel Tank Repair Sleeve - Boss That When You Have The Unfortunately Have The Mishap Of The Sleeve Coming Out During Your Fuel Filter Replacement On A 928/968/944 This Is The Fix That Comes From A  Very Well Respected Porsche Extraordinaire Parts Supplier In The USA  928srus . Not The Easiest Thing To Fit But Lots Of Posts On Porsche Forums About How To Fix The Problem.