Bypass plunger o-ring seal for Hurlcon & Astral gas heaters. Suits all HX, JX, MX, WX gas heaters. They have been Yellow, Gray, and Black over the years. With age, they often softened or totally broke down. Should be replaced every 3-years. 

• HX Gas Heaters: HX 70, HX 120, HX 150
• JX Gas Heaters: JX 130, JX 160
• MX Gas Heaters: MX 125, MX 150, MX 200, MX 250, MX 300, MX 400
• WX Gas Heaters: Wilton WX 75, WX 120

Important Notes:

• We highly recommend replacing the entire bypass, as they wear out over time.
• Stainless Steel Split Pins listed here.