The Roadmaster 790-25 Hy-Power Diodes Bulk Pack is an essential solution for safely integrating your RV's lighting system with a towed vehicle. These diodes ensure that electrical current flows in only one direction—from the motorhome to the towed vehicle's taillights—preventing potential damage to both vehicles' electronic systems due to electrical feedback. Each diode is equipped with a heavy-duty, anodized aluminum heat sink and is epoxy-sealed to withstand harsh environmental conditions. This bulk pack of 25 diodes is ideal for installers and those managing multiple towing setups. Enjoy added peace of mind with a FREE Limited 90-Day Warranty.