... cover material:brass size:3/8", 1/2", 3/4" good quality,best price . CE UL CSTBAT adiator ... plug size 1/4 3/8 1/2plug for radiator installation, with NBR ... . CuZn39Pb3 brass body nickle plated, or brass finish4. Plastic switch (ABS)5. Release: M6, M8, M10, NBR O ... ring sealing,6. Pipe thread connection G1/2, G3/4 BSP/ISO, NPT7. Application: heating line system, radiators8. ...