Astoria Straight Heat Exchanger cups-and-porcelain/cup-and-porcelain-capp and others with 57–58 mm

and others with 57–58 mm baskets

Measure your existing handle's threaded bolt diameter before ordering — the 10mm bolt on this handle does not fit the majority of manufacturers

Because it's held in place purely by the group gasket's compression

then the nut — and reassemble in reverse

Astoria Straight Heat Exchanger cups-and-porcelain/cup-and-porcelain-capp and others with 57–58 mmAstoria Straight Heat Exchanger The oldest version of this heat exchanger, no longer in production. This is limited old stock inventory that has been sitting for roughly two decades, so units show heavy surface oxidation. COMPATIBILITY Fits: older Astoria boiler assemblies using the straight style heat exchanger (discontinued, not interchangeable with later curved versions) INSTALLATION Moderate DIY to professional difficulty; recommend a qualified