Keeping the Ansul fire suppression hood system in your kitchen in good working condition is crucial. Over time, the metal blow off caps for the nozzles get covered in grease and grime and need to be replaced. As a professional firefighter, these caps are what I recommend for the Ansul R102 and Piranha systems. Don't be nervous when the fire marshal comes to inspect your kitchen. Keep your nozzles covered with a set of new metal blow off caps and keep your Ansul hood system in good condition.