Check the listing for details. 🔥🔥10 PACK FIRE SUPPRESSION SYSTEM RUBBER BLOW OFF NOZZLE CAPS..NEW.🔥🔥. Condition: New. Listed at 12.90 USD. free Shipping within the United States only!10-PACK10 -RUBBER FIRE SUPPRESSION SYSTEM BLOW OFF CAPSEACH CAP IS 3/8" IN DIAMETER & 3 1/2" IN LENGTH. No need to pay a Company to come out & install you can install in less than a minute...look at photos THESE ARE METAL BLOW OFF CAPS ARE DESIGN TO BE USED IN HIGH TEMPERATURE AREAS TO PREVENT GREASE AND FOREIGN PARTICLES FROM BUILDING UP IN THE NOZZLE , PREVENTING THE SYSTEM FROM DISCHARGING DURING A FIRE. RUBBER BLOW OFF CAPS THAT ARE DESIGNED TO PREVENT GREASE AND FOREIGN PARTICLES FROM BUILDING UP IN THE NOZZLE, THAT COULD PREVENT THE SYSTEM FROM PROPERLY DISCHARGING DURING A FIRE. THIS IS A VERY VERY ECONOMICAL WAY TO INSURE YOU SYSTEM IS ALWAYS IN GOOD WORKING ORDER...