Valterra 3-Piece Gate Valve [SS Paddle] [4" Slip x 4" Slip] [20 PSI] (6401) magicplastics An O-ring is useful because

An O-ring is useful because it helps maintain dependable leak protection between mating surfaces while supporting cleaner reassembly of the heater

Useful when original assemblies are worn or underperforming

and 153 models

Helps restore dependable spa heating performance

Helps restore serviceable heater plumbing connections

Valterra 3-Piece Gate Valve [SS Paddle] [4" Slip x 4" Slip] [20 PSI] (6401) magicplastics An O-ring is useful becauseThe Valterra 3 piece gate valve with stainless steel paddle is designed for compatible 4 inch slip plumbed systems that need a larger shutoff valve rated for 20 PSI. A valve in this format is useful because it provides line isolation in bigger plumbing runs, while the stainless steel paddle adds appeal for buyers who want a more premium internal valve component. This model is especially useful in large solvent welded systems where serviceability,