Buyers Products 4 Inch Round Stop/Turn/Tail + Backup Combination Light with Light Stripe LED Tubes is used on trucks and trailers to meet FMVSS/CMVSS 108 regulations. This convenient light meets DOT requirements for both a stop/turn/tail and backup light in a single fixture. Patented “Light Stripe” LED technology gives the light a unique, automotive-style look. The light features durable polycarbonate construction and ultra-sonic welding to produce an IP-69 rated watertight housing. It requires one PL-3 and one PL-2 connection. Lights are sold in multiples of 10 and backed with a limited lifetime warranty.