BUILT-IN CHECK TYPE; 3/4 INCH NOMINAL SIZE; HYDRAULIC HEATING SYSTEM APPLICATION; 212 DEG F TEMPERATURE RATING; BRONZE BODY MATERIAL; 100 PSI PRESSURE RATING; FEMALE THREADED X FEMALE THREADED END CONNECTION; 3-3/4 INCH END TO END DISTANCE; LOCKING ACTUATION TYPE; 12 PSI STANDARD FACTORY SETTING; SET PRESSURE RATING 10 TO 25 PSI; 335 MODEL