HIGH TEMPERATURE.  THE UNIQUE PATENTED DESIGN OF THE HUDSON VALVE USES FLUID PRESSURE, AS OPPOSED TO A LEAVER ARM AND BALL, AS THE FORCE TO CLOSE THE VALVE.  THIS COMPACE, SELF-CONTAINED DESIGN GREATLY ENHANCES THE VALVE'S RELIABILITY.  tHE VALVE BODY IS MADE OF DURABLE GLASS-FILLED NYLON 6/6.  INTERNATIONAL PARTS ARE OF ABS PLASTIC, SILICONE, AND STAINLESS STEEL.  WHEN PROPERLY INSTALLED, THE VALVE WILL MEET ANTI-SIPHON REQUIREMENTS.