MORE FRICTIONThe upgraded 15 amp inlet comes with a doubled depth of the front cover from 0.25" to 0.5", and a non-smooth back cover rather than a smooth cover, which brings more tightness for 15 amp power inlet. The shore power inlet 15 amp can be used under bad weather conditions. The new front cover and back cover make the RV power inlet 15 amp windproof, waterproof, snowproof, and dustproof, keep the power inlet receptacle closed under such circumstances, and provide security. SIMPLE INSTALLIt takes four steps to make the RV shore power inlet working. Step 1, We recommend drilling a 2" hole to make some room for a shore power outlet, although a 1-7/8" hole can be tighter. Step 2, Put the 15 amp flanged inlet in the hole, mark the four screw positions. Step 3, fix the recessed male outlet position with the four screws. Step 4, plug and play, the ac inlet now is installed successfully. BRING CONVENIENCEThe RV inlet plug is designed to suit a wide range of applications where a generator or battery charger plug is required. The trailer power inlet is often seen in RVs, boats, sheds, bumpers, trailers, etc. However, some also use the RV shore power plug for snow shovels (eg. toro 521), mobile bar horse trailer, battery charger, griller, etc. The male outlet receptacle will be handy for 110v recessed male outlet connection purposes. PREMIUM SOLUTION We offer the industry standard quality RV power pole. We understand the extra attention should be paid to power inlet plug products. As a result, we upgraded our marine shore power inlet to increase security, especially the front and back cover. Nickel-plated copper pins are implemented in the male inlet receptacle to avoid oxidation. Provided with a square design and four screws, the electrical inlet can be installed very firmly. Ensuring premium recessed male plug.