Check your existing blade's pitch and diameter to ensure it meets the 20" and 28-degree specifications

Concealed adjustment dial protects system parameters from accidental or unauthorized changes

check the model and serial number of your Marley Engineered Products heater against the 4520-2048-000 part number found in the manufacturer's repair parts catalog

while the blue spirit-filled tube (non-mercuric) provides high visibility against the V-shaped aluminum scale without any hazardous material risks

these parts are physically and technically identical

Maxitrol 325-7AL-1 1/2 Regulator 30067439-890 Check your existing blade's pitchThe Maxitrol 325 7AL 1 1 2 is a high performance lever acting line pressure regulator engineered for commercial and industrial gas piping systems. Designed for high capacity applications, this 1 1 2 inch NPT gas regulator manages up to 1,250,000 BTU hr while maintaining a tight positive dead end lock up. This model, also identified as the 325 7AL 1212 NG02, is optimized for systems with a 2 PSI maximum inlet pressure, converting it to a stable 7 11