Radiator Bleed Screws
1/8" Bleed Air / Vent / Valve
Fits hole of approx 3/8"
1/4" Bleed Air / Vent / Valve
Fits hole of approx 1/2"
1/2" Bleed Air / Vent / Valve
Fits hole of approx 3/4"
11mm across flats of hexagonal, 7mm across thread