When firefighters talk about a “handline” or a “preconnect”, they’re almost always referring to attack fire hose — the woven-jacket high-pressure hose that delivers water from the engine pump to the nozzle at the fire. Yet despite being one of the most familiar items of fire-service equipment, attack hose is one of the most frequently mis-specified products in fire-department purchasing. Wrong diameter, wrong jacket construction, wrong service pressure, wrong coupling thread — any of these can mean inadequate flow at the fire, condemned hose after one season, or a failed UL listing inspection.

This guide walks through everything a procurement officer, a brigade chief or a fire-protection engineer needs to know about attack fire hose: the technical definition, how it differs from other fire-hose types, the NFPA 1961 construction requirements, the sizes available, and the typical flow rates and applications. By the end you’ll know exactly what to specify when you order your next batch of attack hose — and what questions to ask the manufacturer to confirm they can deliver what your AHJ requires.

Attack Fire Hose — The Technical Definition

The authoritative definition comes from NFPA 1961: Standard on Fire Hose, which classifies fire hose into four categories — attack, supply, occupant-use, and forestry. The NFPA 1961 Annex A.3.3.4.1 defines attack hose as:

“Attack hose is designed to convey water to handline nozzles, distributor nozzles, master stream appliances, portable hydrants, manifolds, standpipe and sprinkler systems, and pumps used by the fire department. Attack hose is designed for use at operating pressures up to at least 275 psi (19 bar).”

Three things distinguish attack hose from other fire-hose categories:

• Use by trained firefighters. Attack hose is engineered for use by trained brigade members in regular firefighting operations — not by untrained building occupants. The handling characteristics, reaction force at the nozzle, and decision-making required to direct the stream effectively all require formal fire-service training.
• Minimum 275 psi operating pressure (300 psi service test). Attack hose must sustain 275 psi continuous operating pressure with a 300 psi minimum service test pressure per NFPA 1961. Burst pressure under NFPA 1961 must exceed 1,600 psi (110 bar) for double-jacket attack hose.
• Handline use — not supply. Attack hose connects the pump discharge to the nozzle. It is not designed for the long-distance, lower-pressure supply role that rubber-covered LDH supply hose performs between the hydrant and the pump.

In simple terms: attack hose is the hose that sprays water at the fire. Everything else — supply lines, occupant-use cabinet hose, hard suction, wildland progressive lays — uses a different category of fire hose engineered for that specific role.

How Attack Hose Differs from Other Fire-Hose Categories

A common procurement mistake is treating “fire hose” as a single category. NFPA 1961 actually defines four distinct categories, each engineered for a different role. Here is how attack hose fits within the broader fire-hose product family.

The key insight: attack hose is the only category designed for high-pressure operations at the nozzle. Supply hose is optimized for high-volume, low-pressure flow over long distances. Occupant-use hose is built for low-stress emergency deployment by untrained users. Each category has its own NFPA standard reference, its own UL listing, and its own price point.

Attack Hose Construction: Single-Jacket vs Double-Jacket

Modern attack hose is built around a synthetic-rubber lining (EPDM, NBR, or TPU) bonded inside one or two layers of high-tenacity polyester woven jacket. The number of jackets is the single biggest construction decision in attack-hose specification — it determines pressure rating, weight, abrasion resistance and cost.

Single-Jacket Attack Hose

A single-layer polyester jacket bonded to the rubber lining. Service pressure typically 150-300 psi depending on construction grade. Lighter weight, more flexible, lower cost. Used primarily for occupant-use cabinet installations and light-duty industrial applications. Some fire departments still use single-jacket for lower-pressure attack scenarios, but the modern brigade preference is double-jacket.

Double-Jacket Attack Hose

Two layers of woven polyester jacket bonded to the rubber lining. Service pressure 400 psi with 1,200 psi burst. The dominant construction for modern U.S. brigade attack lines — the second jacket dramatically improves abrasion resistance against the gravel, concrete and structural edges that attack hose drags across during a working fire. Double-jacket attack hose is what most U.S. fire departments specify when they hear “attack hose” without further qualification.

Attack Hose Sizes — What to Specify

Unlike supply hose (NFPA 1961 specifies minimum 3½” ID), attack hose has no defined size limit in NFPA 1961. In practice, however, attack hose is supplied in a defined size range determined by handling characteristics, flow requirements and decades of fire-service convention.

The transition from 1½” to 1¾” as the U.S. brigade-attack standard happened in the 1990s. The driver was simple math: 1¾” flows roughly 60% more water than 1½” at the same pump pressure, with only a 7 mm increase in internal diameter and minimal increase in nozzle reaction force. Most modern engine apparatus now carry 200-300 ft of 1¾” preconnect as the primary attack package, with 2½” available as a big-line option for high-challenge fires.

For a complete walkthrough of all fire hose sizes and applications, see our dedicated size reference page.

NFPA 1961 Requirements for Attack Hose

NFPA 1961 establishes the technical floor for any hose sold as “attack hose” in the U.S. market. Manufacturers that self-declare NFPA 1961 compliance must meet all of the following at minimum:

• Service test pressure 300 psi minimum. Hose must withstand 1.5× design service test pressure without thread breakage. Practical effect: 300 psi × 1.5 = 450 psi proof, with burst pressure typically 1,200+ psi.
• Operating pressure 275 psi minimum. Continuous service pressure at which the hose can be operated without failure.
• Abrasion resistance (UL 19 or FM 2111). Hose must pass the third-party abrasion test that simulates jacket wear during normal use.
• Heat resistance (UL 19 or FM 2111). Hose must withstand defined exposure to radiant heat without lining or jacket failure.
• Friction loss specification. For 1½” to 3½” attack hose, the friction loss must meet specified values to ensure pump-discharge calculations are predictable.
• 100,000 cycles bending fatigue. Hose must survive 100,000 cycles of repeated bending without failure (for sizes 3½” and below).
• Hose marking. Each length must be permanently marked with manufacturer name, manufacture date, service test pressure, ID, length and unique serial number.

NFPA itself doesn’t certify products — manufacturers self-declare compliance. The most common third-party certifications for verification are UL 19 listing (most municipal fire-service AHJs) and FM 2111 approval (industrial property insurance carriers). For a complete reference to all fire hose certifications and what they mean, see our Fire Hose Standards & Certifications guide.

Flow Rates and Pump Calculations

Attack hose specification connects directly to your pump-discharge calculation. The right attack hose size depends on the target flow rate at the nozzle, plus the pressure budget for nozzle pressure (50 psi smoothbore or 100 psi fog), elevation loss, and friction loss in the hose itself.

A modern fire-fighting tactic requires each handline to flow at least 100 GPM minimum, with two simultaneous handlines achieving combined uninterrupted flow of 300 GPM. In practice, target flow rates are higher: most modern brigade preconnects target 150-200 GPM minimum per handline at 50 psi smoothbore nozzle pressure.

The nozzle choice interacts with attack-hose specification:

• Smoothbore nozzles (50 psi) work well with longer preconnects (200-300 ft) because the lower nozzle pressure leaves more pressure budget for friction loss. Larger orifice = higher flow at the same pressure.
• Variable-gallonage fog nozzles (100 psi) need a shorter preconnect or higher pump pressure because more of the pump output goes to maintaining the nozzle pressure. Best for shorter handlines where the pump can deliver the necessary 200-220 psi at the pump discharge.

Most pump-discharge calculation manuals provide friction-loss tables for attack hose. For NFPA 1961-compliant 1¾” attack hose, friction loss is approximately 15-25 psi per 100 ft at 150-185 GPM flow.

What to Specify When You Order Attack Hose

The right purchase order for attack hose contains seven specifications. Get these right and the hose will fit your apparatus, pass AHJ inspection, perform as expected at a fire, and last for years of regular brigade use.

1. Internal diameter: 1½”, 1¾”, 2″, or 2½”. Match your apparatus hose-bed configuration and target flow rate. 1¾” is the dominant modern brigade preconnect size.
2. Length per section: 50 ft, 100 ft, or custom. Most U.S. brigade preconnects are loaded as 200-300 ft total (so two or three 100 ft sections), but the exact division depends on your apparatus.
3. Construction grade: Single-jacket or double-jacket. For brigade attack service, specify double-jacket — the abrasion-resistance and pressure-rating advantages justify the price premium.
4. Lining material: EPDM (default), NBR (oil-resistance), or TPU (lightweight). EPDM is the standard for most brigade applications.
5. Coupling thread: NH/NST (U.S. standard), NPSH (some legacy systems), Storz (LDH supply), BS 336 (UK/Commonwealth), GOST (Russia/CIS). NH/NST is the default for U.S. brigade preconnect.
6. Coupling material: Brass (traditional) or aluminum (lightweight). Aluminum has become the modern standard for brigade preconnects to reduce hose-bed weight.
7. Certifications required: NFPA 1961 minimum, plus UL 19 listing for AHJ acceptance, FM 2111 for industrial/insurance-driven projects. Marine projects need additional Classification Society approvals — see our standards guide.

Frequently Asked Questions

What is the difference between attack hose and supply hose?

Attack hose carries water from the pump discharge to the nozzle at the fire — high pressure (275-400 psi), smaller diameter (1½”-2½”), used by trained firefighters. Supply hose carries water from a hydrant or static source to the fire engine pump — lower pressure (120-200 psi), larger diameter (3″-6″ LDH), used to move high volumes of water over longer distances. The two are not interchangeable: attack hose can’t move adequate volume in a supply role, and supply hose can’t handle attack-line pressures or handling.

Why is 1¾” the most common attack hose size?

1¾” (45 mm) became dominant in U.S. brigade service in the 1990s because it represents the optimal balance between flow rate and handling weight. Compared to 1½”, it flows roughly 60% more water (185 GPM vs 120 GPM at the same pump pressure) — but it remains light enough for a one-person handline and has manageable nozzle reaction force. Compared to 2½”, it has less than half the weight per length, making rapid deployment from a hose bed practical for an attacking firefighter.

Does attack hose need UL listing?

Most U.S. AHJs require UL listing as proof of NFPA 1961 compliance. NFPA 1961 allows manufacturers to self-declare compliance, but UL 19 listing provides third-party verification that the hose has passed independent testing for abrasion, heat resistance, friction loss and bending fatigue. For municipal fire-service procurement, UL listing is typically a hard requirement. For industrial property protection and insurance-driven projects, FM 2111 approval is often required in addition to or instead of UL.

How long does attack hose last in brigade service?

Typical service life is 5-10 years depending on use intensity. Double-jacket construction extends the upper end; heavy preconnect departments with frequent calls may replace sooner. NFPA 1962 governs the inspection and testing schedule — annual service test at 300 psi for 3 minutes, plus visual inspection after each fire response. See our Fire Hose Testing & Inspection guide for the complete maintenance schedule.

What lining material should I specify for attack hose?

EPDM is the default for most brigade applications — best balance of heat resistance, ozone stability, and service life at moderate cost. NBR (nitrile) is recommended where the hose might encounter oil or fuel contamination (refineries, industrial sites). TPU (thermoplastic polyurethane) is the lightweight premium option, used where minimum weight matters (wildland operations, helicopter-delivered hose, aerial deployment).