Hammerhead Head Wheel Set [21"/30" Vacuum, Small, 4 Pack] (HH1156) watertestkits Improves replacement confidence and long-term

Improves replacement confidence and long-term usability

This part has practical value because a TheraFlo and TheraMax specific volute helps preserve intended fit

supporting the intended massage and circulation behavior in the spa

An O-ring like this is useful because it helps maintain a cleaner lid seal

Matching the correct 1/4 inch male pipe thread bottom-mount configuration helps preserve intended fit and dependable pressure monitoring

Hammerhead Head Wheel Set [21"/30" Vacuum, Small, 4 Pack] (HH1156) watertestkits Improves replacement confidence and long-termThe Hammerhead HH1156 head wheel set is designed for compatible 21 inch and 30 inch vacuum applications and includes four small wheels. A set like this is useful because it provides a convenient replacement group for the smaller vacuum head wheels when multiple worn parts need to be renewed at the same time. Small wheels can wear gradually and affect how the vacuum head tracks, turns, or rolls across the cleaning surface. Replacing them as a pack can