*PLUMBERSSTOCK EXPERT* responded:
Hello! Yes, it is. This Meridian 4026900 High Altitude Pressure Switch comes with the .52" WC. It will fit with the following model numbers: ABA120NH4R, ABA120NH5R, ABA140NH4R, ABA140NH5R, ABA040NH2R, ABA040NH3R, ABA060NH2R, ABA060NH3R, ABA060NH4R, ABA080NH2R, ABA080NH3R, ABA080NH4R, ABA080NH5R, ABA100NH5R, ABA100NH4R, and the ABA100NH3R. If you're interested in purchasing the Meridian 4026900, simply click "Add to Cart", enter the required information and you'll be on your way. If you have any additional information that you think will help us to assist you, please feel free to contact us. We would be glad to help you.