One time use. Upgrade the security of your protein skimmer with the DC adapter coupler lock! This innovative solution ensures a secure connection between your DC adapter and protein skimmer, giving you peace of mind that your equipment is operating smoothly. Crafted with a durable design, this coupler lock is built to last, providing a semi-permanent solution for your setup. Compatible with a wide range of protein skimmers, it offers a versatile and practical solution to enhance the functionality of your aquarium system. Safeguard your equipment with the DC adapter coupler lock and enjoy worry-free operation with every use!