12504 Metal Nozzle Caps (Pack of 6)

The 12504 Metal Nozzle Caps are durable metal caps used to cover and protect open discharge nozzles in fire suppression systems during installation, maintenance, and inspections. Sold in packs of 10, these fire suppression nozzle caps prevent grease, debris, and cooking residue from entering nozzle orifices and blocking the precision-engineered discharge pattern when the system is needed. A blocked nozzle orifice is one of the most common causes of suppression failure in kitchen fire suppression systems — and nozzle caps are the primary preventive measure.

All kitchen fire suppression system nozzles must be capped at all times except during system discharge. Per NFPA 96, nozzle covers must be present and undamaged at every semi-annual inspection — missing or damaged nozzle caps are an immediate inspection deficiency. The metal construction of the 12504 caps provides superior durability over plastic nozzle covers in the high-temperature, grease-laden environment of a commercial kitchen hood plenum, where plastic caps can melt, warp, or become brittle over time and fail to stay in place.

The 12504 caps are compatible with Amerex KP system nozzles and are a standard fire suppression supply item used across multiple commercial kitchen suppression system brands where the nozzle thread specification matches. For fire protection contractors performing semi-annual inspections across large kitchen suppression system fleets, keeping a supply of 12504 metal nozzle caps on the service vehicle ensures any missing or damaged cap can be replaced immediately rather than requiring a return visit. They work alongside ansul nozzle caps and similar products from other manufacturers in the broader fire suppression nozzle caps category.

Semi-Annual Nozzle Cap Inspection

At every semi-annual NFPA 17A and NFPA 96 inspection, verify each nozzle cap is present, fully seated on the nozzle, and shows no cracking, melting, or deformation. Remove each cap and inspect the nozzle orifice underneath for grease blockage or debris accumulation. A partially or fully blocked nozzle orifice must be professionally cleaned or the nozzle replaced before the system can pass inspection. Reinstall fresh nozzle caps after inspection — never reinstall damaged caps. Document cap condition in the fire suppression system inspection record.

Post-Discharge Replacement

After any system discharge, all nozzle caps must be replaced with new 12504 caps as part of the post-discharge service procedure. Used caps that have been exposed to system discharge pressures and wet chemical agent should never be reinstalled — always use new caps from a fresh 10-pack for every post-discharge service.

Are these caps compatible with ANSUL and Range Guard nozzles?

The 12504 is sized for Amerex KP system nozzles. Compatibility with ANSUL, Range Guard, or Pyro-Chem nozzles depends on the thread specification of those nozzles. Verify dimensional compatibility before installing 12504 caps on non-Amerex systems. ANSUL nozzle caps (ansul system nozzle caps) and Range Guard nozzle caps are available as brand-specific alternatives where the 12504 thread specification does not match.

Can I use plastic nozzle covers instead of metal caps?

Plastic nozzle covers are used in some systems but metal caps like the 12504 provide better long-term durability in commercial kitchen hood environments where heat and grease exposure can degrade plastic over time. Metal caps are the preferred specification for kitchen suppression nozzle protection in high-temperature cooking environments.