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333 Pf rgsten RoaC <br /> Norihbrook. Illin0is 60062-20� <br /> (708) 272-8800- <br /> FAX No. (708) 272-8129 <br /> MCI Mal No. 254-3343 <br /> Caole ULINC NORTHBROOK. iL <br /> U� Underwriters Laboratories Inc.. Telex No. 6502543343 <br /> October 2 , 1991 <br /> Total Containment <br /> Mr . Jim Lawrence <br /> 306 Commerce Drive <br /> Exton , PA 19341-9869 <br /> Our Reference : MH16395 , 90NK21522 <br /> Subject : Enviroflex Primary Piping and Fitting <br /> Dear Mr . Lawrence : <br /> This is to report the status of our Listing investigation of the <br /> subject product under Project 90NK21522 . <br /> We have completed all tests on the Enviroflex primary piping and <br /> fitting with revised nylon bushing and have obtained results which <br /> comply with our requirements for Listing and Follow-Up Service . <br /> UL Listing will be promulgated upon completion of the Follow-Up <br /> Service Procedure describing the construction of the subject <br /> product. <br /> If you have any questions or comments , please contact us . <br /> very truly yours , Reviewed by: <br /> T. A. SKOWERA J. V. Brannan <br /> Engineering Team Leader Associate Managing Engineer <br /> Casualty and Chemical Casualty and Chemical <br /> Hazards Department Hazards Department <br /> TAS :hs <br /> An independent. <br /> not-for-profit organization <br /> testing for pudic safety <br />