Progressive Industries engineers and manufactures a range of high quality electrical solutions designed for the harsh environment. Every product meets exacting performance specifications and is designed to withstand extreme conditions. Progressive Industries Surge Protector Units help protect your RV from voltage spikes that result in costly damage to RV components. Del City also offers a variety of Progressive Industries RV accessories to ensure your recreational vehicles are outfitted for enjoying the worry-free camping lifestyle. Below is a full line of RV accessories: Replacement and extension plugs, dead front and replacement receptacles.