Watkins Replacement Gas Spring for Hot Springs Spas - 71794 Part Number: 71794 This is a gas spring weighing 60 lbs., and reaching 20 inches in length, for Caldera Spas Uprite Cover Lifter. Good for one gas shock. The Endless Pool models this part is for are the following: Endless Pools E2000-58 2017-Current, Endless Pools E500-52 2016-Current, Endless Pools E500-58 2016-Current, Endless Pools E700-52 2016-Current, Endless Pools E700-58 2016-Current, Endless Pools X200-50 2016-Current, Endless Pools X500-50 2016-Current. Hot Spring Spa Supplies carries spa fragrances, air & water valves, control systems, filter accessories, lights, cleaners, pumps, thermostats, and more for virtually every hot spring model.