Thumbscrew 1/4 - 20 x 1.75 inch. These are used to secure your corner skirting pieces on your spa in place. This part is the longer of the two thumb-screws available.
Boomerang brackets (1 pair) are specifically designed for use with the Visionlift Boomerang Cover Lifter by Ultralift. These brackets attach to your existing Ultralift sliding bracket, allowing your hot tub cover to fully open to the ground without the need for additional drilling.
Has the ball in your air control become stuck, or has it started to “whistle?” It is most likely time to replace it. Master Spa Parts has the perfect replacement part for you. The 1-Inch, MG Air Control w/ Blower Assist Tee is compatible with spas and hot tubs that accept a one-inch air control.