... radiator plug with ABS cover material:brass size:3/8", 1/2", 3/4" good quality,best price . CE ... 1/4 3/8 1/2plug for radiator installation, with NBR O-RingHeating Line use Air Release Valve1. Working ... nickle plated, or brass finish4. Plastic switch (ABS)5. Release: M6, M8, M10, NBR O ring sealing,6. ... valve plug1model:HT-L1106 2.material:copper 3.size:3/8", 1/2", 3/4", suitable for general water service ...