Pentair Hot Surface Ignitor [w/Gasket] 500–2000 (2400-286) kingtechnology this Waterway union is a

this Waterway union is a practical solution when a 2-1/2 inch union connection needs to transition into a 2 inch slip line

Installed in the proper configuration

and this G & P Tools version is designed for Waterway Poly Jet applications using the 99-366-1085 reference

A valve like this is useful because it helps manage fuel delivery through the heater

Helps restore dependable spa heat output

Pentair Hot Surface Ignitor [w/Gasket] 500–2000 (2400-286) kingtechnology this Waterway union is aDesigned for service accuracy, Pentair Hot Surface Ignitor [w Gasket] 5002000 helps keep Pentair equipment operating as intended after wear, aging, or routine maintenance. The product belongs in the Heater Parts category, making it easier to locate alongside related repair parts during equipment rebuilds or seasonal service. Inspect sealing surfaces before installation so the replacement can seat cleanly and help prevent leaks, bypass, or pressure