【No Drilling Required】- This upgraded 30Amp outlet box for RV has 3 prefabricated holes in different positions, and provides 3 size of aperture gaskets for the 30 amp rv outlet, including 1/2 inch, 3/4 inch and 1 inch. No longer need to spend time drilling holes, very easy to install.【Large Space & Lockable】- The 30 Amp RV Outlet Box accommodates plugs with handles, plenty of space for easy closure; and the outlet box can lockable to Prevent electricity theft and ensure that the plug is waterproof.【Weather Resistance】- NEMA TT-30R receptacle 30A power outlet box has rugged 3R type waterproof housing and professional electrostatic powder coating to make the product more durable. And the closed lockable outlet box cover to further protect against rain, wind, heavy snow ,etc.【Safety Listed】- Our 30A 125V power outlet box has ETL Listed to ensure your safety to the maximum. This RV electrical outlet has a NEMA TT-30R outlet with Type 3R enclosure for durability. Compatible with common 30A NEMA TT-30 RV power cords，and it can supply for EV, camper, trailer.【After-sales Service】 - Risornda offers 24/7 after-sales support, a 30-day full refund policy, and a 3-year warranty for our 30A RV power outlet box. If you encounter any problem, please contact our store directly, we will try our best to solve the problem for you.