Gateway Supply Co is a family owned and operated Wholesaler located throughout South Carolina. Founded in 1964 by 3 veterns i ... n the industry. Seeking to change the Plumbing and HVAC wholesale business. Gateway Supply is a Plumbing & HVAC wholesaler, specializing in Commerical, Residential and Custom homes. Operating out of 14 locations in South Carolina. We have an online store and locations with luxurious showrooms displaying new ideas and inspiration. For more information please visit our website: WWW.GATEWAYSUPPLY.NET read more