Legrand - Pass & Seymour L1430PCCV3 Industrial-Strength NEMA L14-30P Turnlok Locking Plug 

Generator Plug 30A, 125/250 Volt | IP20 Suitability, 4-Wire

• INDUSTRIAL-STRENGTH: Brass alloy plug blades and connector contacts resist heat rise, providing excellent conductivity
• INSTALLS 4x FASTER: Quick-thread assembly screws install four times faster than competitive products; device comes disassembled and tri-drive backed-out screws come ready to wire
• RUGGED, NON-SLIP NYLON HOUSING: easy-grip contour molded into the back body prevents hand slippage
• SUPERIOR CORD PULL-OUT PROTECTION: Scallop shell design with double dovetail protects against cord pull-out forces
• CLEAR VIEW OF CONNECTION: clear, high-impact-resistant thermoplastic terminal chamber
• "CORD PROTECTION FROM HARMFUL ELEMENTS: Integral flexible rubber cord grommet conforms to and seals around cord to provide protection from oils, water, or chips entering wiring chamber"
• CORD DIAMETER: .225"-1.150"