Ansul Hose Assembly 20LB - 428736

The Ansul 428736 is a complete discharge hose assembly for 20-lb Ansul portable fire extinguishers, including the nozzle and fittings for effective agent delivery. The hose assembly connects the extinguisher valve outlet to the discharge nozzle, providing the flexible conduit through which pressurized agent travels from the cylinder to the fire. For 20-lb extinguisher models, the hose assembly provides the operator with directional control over the discharge stream — allowing the extinguisher's substantial agent charge to be accurately directed at the fire base from a safe operating distance.

The hose and nozzle assembly is one of the most physically stressed components of a portable fire extinguisher in active service. The hose flexes with every use and monthly inspection, UV exposure degrades the outer jacket in outdoor installations, and the nozzle tip is subject to impact damage from being bumped or dropped. NFPA 10 annual inspections must verify that the hose assembly is free of cracking, kinking, blockage, and fitting corrosion — any hose defect that compromises the discharge path integrity is an immediate annual inspection deficiency.

The 428736 is a pre-assembled hose and nozzle unit that replaces the entire discharge assembly in a single service operation — no individual hose, fitting, or nozzle components to source separately. It is available through authorized ansul distributors as part of the ANSUL fire extinguisher parts service catalog for 20-lb portable units. For fire extinguisher service shops managing ANSUL 20-lb extinguisher fleet accounts, keeping the 428736 in van stock alongside fill cap gaskets and O-rings ensures complete 20-lb annual service can be performed in a single visit.

Annual Hose Inspection

During every NFPA 10 annual inspection, flex the hose through its full range of motion and inspect the entire hose length for cracking, kinking, abrasion damage, and fitting corrosion at both the valve connection and the nozzle end. Check the nozzle orifice for blockage. A hose with any crack or structural compromise must be replaced with the 428736 assembly before the extinguisher is returned to service — a hose failure during discharge could result in uncontrolled agent release and operator injury.

Internal Examination

At the 6-year and 12-year internal examination, remove the 428736 hose assembly and inspect the valve outlet fitting threads for damage. Verify the hose interior is clear of agent residue or blockage before reinstalling. Replace the assembly if the hose jacket shows surface cracking, the nozzle shows any impact damage, or any fitting shows corrosion that cannot be cleaned. Document hose assembly condition in the fire extinguisher inspection and maintenance tags record.

Is this the same as the hose and nozzle assembly fast (429543)?

No. The 428736 is the hose assembly for 20-lb ANSUL extinguishers. The 429543 is a different hose and nozzle assembly for a different ANSUL model. Always verify the correct hose assembly part number for the specific ANSUL extinguisher model being serviced using the ANSUL fire extinguisher parts list — the hose assembly specifications (length, fitting thread, nozzle orifice) differ by model and are not interchangeable.

Can I replace just the nozzle tip instead of the full 428736 assembly?

If only the nozzle tip is damaged and the hose body and fittings are in serviceable condition, a nozzle-only replacement may be possible depending on the ANSUL model's design. However, if the hose shows any cracking or the fittings show corrosion, replace the entire 428736 assembly. A partial repair that leaves a compromised hose in service creates a hidden failure risk. Consult the ANSUL fire extinguisher parts documentation for your specific model's repair options.