Demco Manufacturing Company P.O. Box 189, 4010 320th Strret , Boyden , Iowa 51234 USA About Solutions products Publications videos Downloads Companies Demco Manufacturing Company Videos Demco E-Z Latch Coupler Video Demco E-Z Latch Coupler Video 0 Share Demco's E-Z Latch Coupler assists with completing the most important step of connecting a trailer to a towing vehicle. That step is getting the coupler attached and secured. Customer comments No comments were found for Demco E-Z Latch Coupler Video. Be the first to comment! Add your comment Publish your comment Great! comment successfully added!