9" Hand Cup for Flat Surfaces with Low Vacuum Audio Alarm

Wood's Powr-Grip N5450WBP — 9" All-Metal Handle Vacuum Hand Cup for Flat Surfaces with Low Vacuum Audio Alarm (150 lbs / 68 kg)

The Wood's Powr-Grip N5450WBP is the premium safety version of the standard N5450, adding a Low Vacuum Audio Alarm (LVAA) that emits an audible warning from the plunger when vacuum pressure drops to a critical level — providing a second, independent safety alert that does not require the operator to maintain visual contact with the red-line indicator during a lift. Featuring a 9" (23 cm) standard rubber suction pad (Model G0725), an all-metal handle and plunger, and a rated load capacity of 150 lbs (68 kg) on flat smooth, nonporous surfaces, the N5450WBP delivers the same high-capacity flat-surface performance as the N5450 with an additional layer of audible vacuum loss protection critical for overhead lifts, high-noise environments, and applications where PPE or sightline obstructions prevent continuous visual monitoring of the vacuum indicator. Battery powered (AAA battery included). The N5450WBP (SKU: 91707, Model: N5450WBP) is manufactured by Wood's Powr-Grip and ships with a protective carrying case.

The N5450WBP is identical to the N5450 in pad, capacity, handle construction, and surface ratings — the sole differentiator is the Low Vacuum Audio Alarm plunger, which adds an audible warning channel to the existing red-line visual indicator. In any lift where the operator cannot continuously monitor the red-line indicator — overhead glass installation, multi-person coordinated lifts where one operator cannot see the cup, noisy construction environments where a verbal warning might not be heard, or any application where safety regulations require redundant vacuum loss alerting — the N5450WBP is the correct and safer choice over the standard N5450.

Key Features & Benefits

Low Vacuum Audio Alarm (LVAA) — Audible Warning During Vacuum Loss

The N5450WBP’s defining feature is its Low Vacuum Audio Alarm plunger, which emits an audible warning signal when vacuum pressure drops to a critical level during a lift. This audio alarm operates independently of the red-line visual indicator, providing a second, redundant safety channel that alerts the operator — and nearby personnel — to vacuum loss even when the red-line indicator cannot be seen. The audio alarm is particularly critical in three scenarios: (1) overhead lifts, where the operator is looking up and cannot see the indicator on the cup body; (2) high-noise environments, where the alarm must be loud enough to be heard over construction site noise — confirm the alarm volume is adequate for your specific environment; and (3) multi-person lifts, where the operator holding the cup may not be the person monitoring the load. The LVAA is battery-powered (AAA battery included and replaceable).

Dual Safety Alerting — Audio Alarm Plus Red-Line Visual Indicator

The N5450WBP retains the standard red-line visual indicator in addition to the audio alarm, providing two independent vacuum loss warning channels. The visual indicator remains the primary monitoring tool during lifts where the operator can see the cup; the audio alarm provides backup alerting when visual monitoring is not possible or is interrupted. This dual-channel safety design makes the N5450WBP the highest-safety-specification hand cup in the standard WPG lineup for flat-surface applications.

All-Metal Handle and Plunger — Maximum Durability

Both the handle and plunger are constructed from metal, providing maximum structural rigidity and long-term durability for repeated heavy-duty professional use. The all-metal construction resists deformation under sustained heavy loads and delivers consistent vacuum engagement and release action over the tool’s service life. The audio alarm mechanism is integrated into the metal plunger assembly and powered by the AAA battery.

150 lb (68 kg) Rated Load Capacity

The N5450WBP is rated for loads up to 150 lbs (68 kg) on flat, smooth, nonporous surfaces — identical to the standard N5450. This high capacity enables single-operator handling of large, heavy flat panels that would otherwise require a two-person lift. The audio alarm is especially valuable at or near the rated capacity limit, where vacuum loss would result in a sudden drop of a heavy load.

9" Standard Rubber Suction Pad (Model G0725)

The 9" (23 cm) G0725 pad provides a large contact area for strong, stable vacuum retention on flat smooth surfaces. The G0725 pad is shared with the N5450, N5000, and N5300, making replacement pads interchangeable across all four models. Replacement pads are available separately through Wood's Powr-Grip authorized distributors.

AAA Battery Included — Protective Carrying Case Included

The N5450WBP ships with an AAA battery installed and ready for use. The battery is user-replaceable — verify battery condition before each use to ensure the audio alarm is operational. The N5450WBP ships with a protective carrying case that keeps the pad clean and protected between uses.

Common Applications

Overhead Glass Installation

Glaziers installing overhead glass panels — including skylights, overhead curtain wall units, and ceiling glass — use the N5450WBP where the operator is looking upward during the lift and cannot maintain visual contact with the red-line indicator on the cup body. The audio alarm provides the critical vacuum loss warning that the visual indicator cannot deliver in this orientation. This is the primary application that makes the N5450WBP the correct choice over the standard N5450.

High-Noise Construction Environments

On active construction sites where ambient noise from equipment, tools, and operations is high, the audio alarm provides a vacuum loss warning that can be heard by the operator and nearby personnel even in noisy conditions. Confirm the alarm volume is adequate for your specific noise environment before relying on it as the primary warning channel in high-noise settings.

Multi-Person Coordinated Lifts

In multi-person lifts where the operator holding the cup is not the person monitoring the load — such as when one operator positions the cup and another guides the panel into place — the audio alarm alerts all personnel in the vicinity to vacuum loss, not just the person with a direct sightline to the indicator. This improves overall lift safety in coordinated team operations.

Safety-Regulated Environments

In environments where safety regulations, site safety plans, or insurance requirements mandate redundant vacuum loss alerting for overhead or heavy panel lifts, the N5450WBP’s dual-channel audio+visual alarm system satisfies requirements that the standard N5450’s visual-only indicator cannot meet. Consult your site safety plan and applicable regulations to determine whether redundant alerting is required for your application.

Heavy Flat Glass and Stone Panel Handling

For any heavy flat glass, stone, or panel handling application at or near the 150 lb capacity limit, the N5450WBP’s audio alarm provides an additional safety margin by alerting the operator to vacuum loss before a catastrophic drop can occur — particularly valuable when handling panels whose weight makes a sudden drop especially dangerous.

Compatible Materials

• Plate glass and float glass (flat)
• Tempered and laminated safety glass (flat)
• Polished granite, marble, and engineered stone (flat)
• Smooth painted or coated metal panels (flat)
• Glazed ceramic and polished porcelain tile (flat)
• Any smooth, nonporous flat surface requiring safe manual lifting up to 150 lbs — particularly overhead or high-risk lift applications

Not compatible with: curved surfaces (flat only); rough, textured, or porous surfaces; surfaces contaminated with oil, wax, or debris in the pad contact area; concrete, brick, unpolished stone, wood, or drywall.

Product Documents

• N5450WBP Instructions — Low Vacuum Audio Alarm (PDF)
• N5450WBP Specifications — Low Vacuum Audio Alarm (PDF)

Application Instructions

Step 1: Pre-Use Battery and Alarm Check

1. Verify the AAA battery is installed and in good condition — test the audio alarm function before each use session. A dead or missing battery disables the audio alarm, leaving only the red-line visual indicator as the vacuum loss warning.
2. Confirm the audio alarm is audible in your specific work environment — in high-noise environments, verify the alarm volume is sufficient to be heard over ambient noise before relying on it as a warning channel.

Step 2: Surface Assessment

1. Confirm the surface is smooth, flat, and nonporous — do not proceed on rough, textured, porous, or curved surfaces.
2. Clean the pad contact area — remove dust, oil, moisture, and debris.
3. Verify the panel weight does not exceed 150 lbs (68 kg).

Step 3: Pad Inspection and Preparation

1. Inspect the G0725 suction pad for cuts, cracks, hardening, or contamination. Replace if damaged.
2. Wipe the pad face clean before each lift.
3. Ensure the pad is at operating temperature (above 10°F / -12°C) before use.

Step 4: Attaching the Cup

1. Position the pad flat against the surface with full perimeter contact across the 9" diameter.
2. Engage the vacuum mechanism using the metal handle/plunger until firm resistance is felt.
3. Check the red-line vacuum indicator — confirm it shows a stable, full vacuum before lifting.
4. Apply a controlled test load (firm downward pull) to verify seal integrity before committing to the full lift.

Step 5: Lifting, Positioning, and Release

1. Lift smoothly — avoid sudden jerking motions that can break the vacuum seal.
2. Monitor the red-line indicator when possible; rely on the audio alarm as the backup warning channel when visual monitoring is not possible (e.g., overhead lifts).
3. If the audio alarm sounds during a lift, lower the load immediately to a stable surface — do not attempt to continue the lift or reposition the panel.
4. Do not exceed the 150 lb (68 kg) rated load capacity.
5. Lower the load fully to a stable surface before releasing the vacuum.
6. Engage the release mechanism slowly and in a controlled manner.
7. Clean the pad after use and store in the supplied protective carrying case.

Technical Specifications

Safety Data Summary

Hazard Information

• A dead or discharged battery disables the audio alarm — verify battery condition before every use session; the red-line visual indicator remains active regardless of battery state
• The audio alarm volume may not be sufficient in all high-noise environments — verify alarm audibility in your specific work environment before relying on it as the primary warning channel
• If the audio alarm sounds during a lift, lower the load immediately — do not attempt to continue the lift
• Vacuum loss during a lift can result in sudden load drop, causing serious injury or property damage
• Overloading beyond 150 lbs (68 kg) rated capacity may cause sudden cup release without warning
• Use on curved, rough, textured, or porous surfaces will prevent a full pad seal — flat surfaces only
• Damaged or contaminated suction pads must be replaced before use
• Operating below 10°F (-12°C) may degrade rubber pad performance and vacuum retention
• Do not use above 5,000 ft (1,500 m) elevation

Personal Protective Equipment

• Safety glasses or face shield when handling glass panels
• Cut-resistant gloves rated for glass and stone handling
• Steel-toed safety footwear
• Hard hat when working in overhead or multi-level environments
• Hearing protection where required — note that hearing protection may reduce the audibility of the audio alarm; assess alarm audibility with PPE in place before relying on it

Safe Handling

• Verify battery condition and test the audio alarm before every use session
• Confirm audio alarm audibility in your specific work environment, including with any PPE worn
• Inspect the pad and clean the contact area before each lift
• Never exceed the rated 150 lb load capacity
• Lower the load immediately if the audio alarm sounds or if vacuum loss is detected on the red-line indicator
• Store in the supplied carrying case to protect the pad between uses

Frequently Asked Questions

Q: What is the Low Vacuum Audio Alarm (LVAA) and how does it work?
A: The Low Vacuum Audio Alarm is an integrated feature of the N5450WBP’s metal plunger that emits an audible warning signal when vacuum pressure drops to a critical level during a lift. It is powered by a AAA battery (included) and operates independently of the red-line visual indicator. When vacuum pressure falls below the alarm threshold, the plunger emits an audible alert — warning the operator and nearby personnel to lower the load immediately. The alarm provides a second, independent safety channel for situations where the red-line indicator cannot be seen.

Q: What is the difference between the N5450WBP and the standard N5450?
A: The N5450WBP is identical to the N5450 in pad (G0725), capacity (150 lb), handle construction (all-metal), and surface ratings (flat, smooth, nonporous). The sole difference is the Low Vacuum Audio Alarm plunger, which adds an audible vacuum loss warning to the standard red-line visual indicator. Choose the N5450WBP for overhead lifts, high-noise environments, multi-person lifts, or any application where visual monitoring of the red-line indicator is not continuously possible; choose the standard N5450 for standard flat-surface applications where the visual indicator is sufficient.

Q: What happens if the battery dies during a lift?
A: If the battery is dead or discharged, the audio alarm will not function — but the red-line visual indicator remains active regardless of battery state. The cup will still provide vacuum loss warning through the visual indicator. Always verify battery condition before each use session to ensure both warning channels are operational. Replace the AAA battery immediately if the alarm does not function during pre-use testing.

Q: Will the audio alarm be heard in a noisy construction environment?
A: The audio alarm is designed to be audible in typical work environments, but its effectiveness in high-noise environments depends on the specific ambient noise level and the operator’s proximity to the cup. Always verify alarm audibility in your specific work environment — including with any hearing protection worn — before relying on it as the primary warning channel. Note that hearing protection may reduce the audibility of the alarm.

Q: Is the G0725 pad interchangeable with the standard N5450?
A: Yes. The N5450WBP, N5450, N5000, and N5300 all use the G0725 standard rubber pad (9" diameter), making replacement pads interchangeable across all four models. Replacement pads are available separately through Wood's Powr-Grip authorized distributors.

Q: Is this product made to order?
A: Yes. This product is made to order and all sales are final. Please confirm your surface type, load requirements, and application environment before placing your order.

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