Utica-Dunkirk 43300977 Push Nipple 318518-761 OEM design eliminates the need

OEM design eliminates the need for field-fabricated drainage solutions

providing compatibility with over 550 single-stage HSI ignition control models

It serves as a direct drop-in replacement for parts 1172616 and EF17BZ112

and ignition controls

Utica-Dunkirk 43300977 Push Nipple 318518-761 OEM design eliminates the needThe Utica Dunkirk 43300977 Push Nipple is a heavy duty, cast iron 4 inch push nipple engineered specifically for sealing the cast iron sections of Dunkirk D249 and ESC Series IV boilers. Unlike standard rubber gaskets or steel nipples that can fail under extreme thermal cycling, this machined cast iron nipple shares the same expansion coefficient as the boiler sections themselves. This ensures a leak proof boiler seal that maintains structural