Leviton offers a large selection of 15, 20, 30 and 50 amp Straight Blade Plugs and Connectors, available in a wide variety of features. These rugged performers are moisture, chemical and abuse-resistant and they?re ideal for indoor and outdoor use. the EPTR rubber-backed plugs and connectors stand up to rough use, protecting against dirt and moisture. The deep-slotted, backed-out terminal screws draw backwire clamps securely over stripped leads for maximum conductivity.