Location Info Locations Tri-Supply & Equipment of Dover Tri-Supply & Equipment of Dover Address and Contact Address: 5298 South Dupont Highway Dover, DE 19901 US Phone: 302-697-0300 Fax: 302-698-3600 Email: [email protected] Get Driving Directions Enter your location: Get directions Business Hours Sun Closed Mon - Fri 6:30 am - 4:00 pm Sat Closed