A retractor handle is attached to the retraction end of a core wound permeator or filter module for withdrawing the module form its containment housing without requiring special tools. The retraction handle can be a resin pull ring flexibly attached to a flange of a plug that closes the retraction end...http://www.google.com/patents/US4767531?utm_source=gb-gplus-sharePatent US4767531 - Retractor for permeator or filter module
