(5) 6540-211* Sundance Spas Jet Back , 0.75 Barb *Retrofit jetback details To adapt barb jetback #5 (#6540-211) to older rigid pipe spas with slip style jetback, the following parts are required: A. 6570-033, Hose slamp B. 6540-744, 0.75 clear Hose, 6 C. 6540-065, Adapter, 0.75 Barb x 1 Spigot/0.75 Slip