The instructions included with your door or from www.cardinalshower.com should give you step by step instruction for installing your new door. Should you still need help please call Cardinal Shower Enclosures @ 800-826-2577 and ask for customer service.
Shower Door | American Shower and Tub Door Inc. | Shower Doors
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Thank you guys very much. I need to share this with you. I just retired a year ago and have been working on a home in Longmont. It has been GREAT doing business with you and your company. I didn't need the hassle (had plenty when working) and didn't get it from you. Thanks Again. GREAT JOB!