McDonnell Miller (127100) Model 25A-HD Head MechanismModel number 25A HD is a head mechanism for model number 25 A controls. Head mechanisms include everything except a float chamber. They allow for quick and easy replacement by removing the bolts on the float chamber and then removing and replacing the new unit, with no need to disrupt piping. Part Number : 127100 Model: 25A HD

2 3/4 Diameter: 4 1/8” Adjustable Size: 3 1/4 x 5

suitable for both steam and hot water boilers

Range: 50° – 82°F

Individual room control

we have a radiator to suit your style

Model: B-5

more descriptive model numbering system Stainless steel springs are standard PFA Teflon seat resists corrosive boiler chemicals Pressure settings from 30 to 200 psig Rust-proofed steel stem and spring washers Lower control ring ensures short

Quick-change replaceable cartridge valve and strainer

Series: 13-200

Hydrolevel and other manufacturers

Manual reset

Part Number: 103351LF