A flush cup and flush cup extender for use on electrical discharge machines (EDM). The standard upper and lower flush cups are replaced with improved flush cups which have a threaded portion surrounding the nozzle of the flush cups. Various flush cup extenders can then be threadingly attached to the...http://www.google.com/patents/US5384443?utm_source=gb-gplus-sharePatent US5384443 - Flush cup extenders for electrical discharge machines
