How often should the discharge hose be replaced?

Inspect at every annual service. Replace at the 5-year refill as standard practice, or immediately if you observe cracking, hardening, softening, kinking, coupling play, or internal blockage.

Why EPDM rubber instead of PVC or silicone?

EPDM offers the best combination of ozone resistance, UV stability, temperature range (–30 °C to +80 °C), and chemical compatibility with all common extinguishing agents. PVC hardens and cracks in cold environments; silicone is more expensive and has lower abrasion resistance.

Can I use a hose from one extinguisher brand on another?

Only if the valve outlet thread, bore size, and length match. There is no universal standard across all brands for outlet thread dimensions. Always verify compatibility before fitting a replacement hose.

What causes the brass coupling to leak?

Common causes are cross-threading, worn thread sealant, O-ring failure, and overtightening that deforms the coupling. During reassembly, apply fresh PTFE tape or liquid sealant, hand-tighten, and then snug with a spanner—do not use excessive force.

Can a blocked hose be cleaned and reused?

Only if the blockage is loose powder that can be blown out with compressed air and the hose passes a subsequent pressure test. Compacted or caked blockages, or blockages caused by moisture-induced powder solidification, indicate internal degradation—replace the hose.

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Extinguisher Discharge Hose – EPDM Rubber with Brass Coupling

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Product Details

MaterialEPDM rubber (inner + outer)

Inner Bore8 mm / 10 mm / 12 mm

Standard Lengths400 mm (2–4 kg) / 600 mm (6–10 kg)

Coupling (Valve End)Brass swivel, IS 15683 thread

Coupling (Nozzle End)Moulded or crimped adapter

Working Pressure20 bar

Burst Pressure≥ 60 bar

Temperature Range–30 °C to +80 °C

Agent CompatibilityDry powder, foam, water, wet chemical

StandardIS 15683 / EN 3-8

PackagingPack of 5 / 10 / 25 pcs

Extinguisher Replacement Parts

Extinguisher Discharge Hose – EPDM Rubber with Brass Coupling

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Description

The discharge hose is the operator's directional control link between the extinguisher valve and the fire. It allows the user to aim the agent stream precisely at the base of the fire while keeping the heavy cylinder at a comfortable working distance. On extinguishers above 4 kg, the hose is not optional—it is a code-mandated component per IS 15683, because aiming a rigid nozzle mounted directly on the valve of a 6 kg or 9 kg cylinder at a floor-level fire is impractical and dangerous.

This hose is constructed from EPDM (ethylene propylene diene monomer) rubber, selected for its excellent resistance to ozone ageing, UV degradation, and the full range of fire-extinguishing agents including dry chemical powder, AFFF foam, water, and wet chemical solutions. The inner tube is smooth-bore to minimise flow resistance, while the outer cover is textured for grip and abrasion resistance.

Each hose is supplied with a brass swivel coupling at the valve end (to prevent kinking during discharge) and a moulded or crimped nozzle adapter at the discharge end. The swivel coupling threads match IS 15683 valve outlet specifications. Hose lengths are standardised at 400 mm for 2–4 kg extinguishers and 600 mm for 6–10 kg units. Longer hoses are available for wheeled (trolley-mounted) extinguishers.

Hose failure is one of the most commonly cited reasons for extinguisher rejection during annual servicing. UV exposure, ozone cracking, rodent damage, and physical abuse (hanging objects on the hose, using it as a carrying handle) all contribute to degradation. A hose that shows surface cracking, hardening, softening, kinking, or coupling looseness must be replaced—there is no repair for a compromised rubber hose.

During every refill, the hose should be visually inspected externally, internally (blow through it and check for blockage), and pressure-tested at 1.5× working pressure per the IS/EN test protocol. Hoses that pass inspection are re-attached with new thread sealant on the coupling; those that fail are discarded and replaced.

Storage of spare hoses is straightforward: hang them loosely in a cool, dark area away from UV light, ozone-generating equipment (electric motors, welding sets), and chemical solvents. Do not coil them tightly or stack heavy objects on them, as permanent deformation compromises flow and coupling alignment.