Amazon.ca RV 30A 125V Camp Power Extension Cord, NEMA TT- 30P to NEMA TT-30R, Straight blade to straight blade. Clear ends Approval: Plug, STW: UL, C-UL Cable:50FT STW 10/3 From the Manufacturer RV 30A 125V Camp Power Extension Cord, NEMA TT-30P to NEMA TT-30R, Straight blade to straight blade. Clear ends Approval: Plug, STW: UL, C-UL Cable:50FT STW 10/3.