Hammerhead Head Wheel Set [21"/30" Vacuum, Small, 4 Pack] (HH1156) watertestkits Union-style valves are useful because

Union-style valves are useful because they can simplify service and future replacement work

Improves replacement confidence and long-term usability

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

replacing the complete jet can often be the most efficient and confidence-inspiring repair path

Hammerhead Head Wheel Set [21"/30" Vacuum, Small, 4 Pack] (HH1156) watertestkits Union-style valves are useful becauseThe 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