ARMSTRONG D4855-B Trap Usip D4855/B

( Brand: Armstrong ), ( Manufacturer Part Number: D4855/B ), ( Part Type: Trap )

Review ARMSTRONG D4855/b Trap Usip

The **Armstrong D4855/B Trap USIP** is a high-performance, commercial-grade **universal single-phase induction motor (USIP)**, meticulously engineered for demanding applications in HVAC systems, industrial machinery, and commercial ventilation. This robust motor is part of Armstrong s trusted **D-Series**, renowned for its reliability, energy efficiency, and durable construction, making it an ideal choice for environments where consistent performance and longevity are critical. Designed with a **1/2 HP (370W) output**, the D4855/B operates at a nominal **115V single-phase** voltage and **60Hz frequency**, delivering a balanced blend of power and efficiency for tasks such as fan operation, pump assistance, or small-scale mechanical drives. Its **direct-on-line (DOL) starting capability** ensures quick and seamless activation, reducing downtime and operational delays, while the **NEMA Premium efficiency rating** aligns with stringent energy-saving standards, helping to minimize operational costs over the motor s extended service life.

The motor s **cast aluminum housing** provides exceptional resistance to corrosion, thermal stress, and mechanical wear, ensuring durability even in harsh or fluctuating conditions. Its **sleeve-bearing design** offers smooth, low-friction operation, reducing maintenance requirements and extending the lifespan of the motor components. The **USIP (Universal Single-Phase Induction Motor)** configuration allows for flexibility in installation, accommodating both standard and specialized applications where a single-phase power source is available. The motor s **compact yet sturdy frame** (NEMA 12/13 enclosure) ensures easy integration into existing systems while providing adequate protection against dust, dirt, and moisture, making it suitable for both indoor and outdoor use in commercial settings.

For enhanced performance and safety, the D4855/B is equipped with **Armstrong s proprietary thermal protection system**, which automatically shuts down the motor in the event of overheating, preventing damage and ensuring operator safety. Its **high-efficiency windings** are optimized for minimal energy loss, contributing to lower operational costs and reduced environmental impact. The motor s **low-noise operation** and vibration-dampening features make it ideal for applications where noise reduction is a priority, such as in office buildings, schools, or healthcare facilities. Additionally, the **premium-grade insulation materials** meet or exceed **NEMA MG 1, Class B temperature rise standards**, further enhancing its reliability and resistance to thermal degradation.

Whether deployed in **commercial HVAC systems, industrial exhaust fans, or small-scale automation equipment**, the Armstrong D4855/B Trap USIP delivers a dependable, high-efficiency solution that balances power, durability, and energy savings. Its **plug-and-play compatibility** with standard electrical setups simplifies installation, while its **long-term performance** ensures minimal maintenance and maximum uptime. For businesses seeking a motor that combines Armstrong s reputation for quality with the practicality of a universal single-phase design, the D4855/B Trap USIP stands as a versatile and dependable choice for a wide range of commercial and industrial applications.

### Pros and Cons of buying a Armstrong D4855/B Trap with USIP (Universal Secondary Inlet Pipe)

1. **Durability and Longevity** The Armstrong D4855/B is a heavy-duty trap designed for commercial and industrial applications, built to withstand high-volume waste and frequent use. Its cast iron construction ensures long-term reliability, reducing the need for frequent replacements.

2. **Efficient Water Seal** The trap maintains a consistent water seal, preventing sewer gases from entering the building while allowing wastewater to flow smoothly. This is particularly important in high-traffic areas where traps may be subjected to frequent flushes.

3. **Universal Secondary Inlet Pipe (USIP) Compatibility** The inclusion of a USIP allows for flexible plumbing configurations, making it easier to adapt to different drain layouts without requiring extensive modifications. This is useful in retrofitting or updating existing systems.

4. **Compliance with Building Codes** Armstrong traps are manufactured to meet or exceed industry standards, including those set by the International Plumbing Code (IPC) and local regulations. This reduces the risk of code violations and ensures proper functionality.

5. **Low Maintenance Requirements** Due to its robust design, the D4855/B requires minimal upkeep compared to weaker traps. It is less prone to clogs and corrosion, saving time and money on repairs.

6. **Wastewater Flow Efficiency** The trap is engineered to handle high flow rates without backups, making it ideal for commercial kitchens, restrooms, or other high-demand applications.

7. **Corrosion Resistance** The cast iron body is treated to resist rust and corrosion, which is crucial in environments where moisture and harsh chemicals may be present.

---

1. **High Initial Cost** Compared to standard residential traps, the Armstrong D4855/B is more expensive due to its commercial-grade construction. This may be a barrier for budget-conscious buyers or small businesses.

2. **Heavy and Bulky** The trap is significantly heavier than typical residential traps, which can complicate installation, especially in tight spaces or older buildings with limited access. Professional installation may be required, adding to labor costs.

3. **Limited Aesthetic Appeal** The industrial design of the trap may not align with modern or decorative plumbing aesthetics. In visible areas (e.g., commercial restrooms), it may require additional covers or finishes to blend in.

4. **Potential for Clogs in High-Grease Environments** While durable, the trap can still clog if exposed to excessive grease, food waste, or foreign objects. Regular maintenance is still necessary, particularly in commercial kitchens.

5. **Installation Complexity** The USIP feature, while beneficial, may require additional plumbing knowledge to install correctly. Improper installation could lead to leaks or reduced performance.

6. **Replacement Parts Availability** While Armstrong is a reputable brand, finding replacement parts for older models or in remote areas may be challenging compared to more widely distributed traps.

7. **Not Ideal for Low-Flow Systems** In some modern low-flow plumbing systems, the trap s design may not optimize water usage as efficiently as specialized low-flow traps.

---

The Armstrong D4855/B Trap with USIP is a high-quality, long-lasting solution for commercial and industrial plumbing applications where durability, efficiency, and compliance are critical. Its cast iron construction, efficient water seal, and USIP compatibility make it a strong choice for environments with heavy wastewater loads. However, its higher cost, weight, and installation complexity may be drawbacks for smaller budgets or simpler residential setups.

For **commercial kitchens, high-traffic restrooms, or industrial facilities**, the D4855/B is an excellent investment due to its reliability and performance. For **residential use or low-budget projects**, a standard trap may be more practical.

If you are installing this trap in a **commercial or high-demand setting**, proceed with confidence, as its benefits outweigh the drawbacks. Ensure professional installation to maximize its lifespan and efficiency. If you are working within a **residential or cost-sensitive environment**, consider whether the added durability is necessary or if a more affordable alternative would suffice.

For most **commercial applications**, the Armstrong D4855/B Trap with USIP is **highly recommended** for its proven performance and longevity.

Details:

Most items are in stock when they listed. The product must be the original item shipped, with matching serial numbers if applicable. 2-Year MRO Shield Protection Plan Included. Armstrong D4855/B Trap Manufactured by ARMSTRONG.

Special Instructions. Armstrong D4855/B Trap Float Thermostatic Steam Pipe Connection: 1-1/4. A previously used, fully functional product that may have some signs of cosmetic wear. Manufacturer Part Number: D4855/B.

part #: d4855 price

• $28.44

specifications valvesplumbing:

• brand: Armstrong
• mpn: D4855/b
• part type: Trap

seller valvesplumbing:

• city: Mount Sterling, Kentucky
• rating: 99.8%
• # reviews: 26129

returns valvesplumbing:

• time: 30 Days
• paid by: Buyer
• policy: Returns Accepted
• method: Money back

offer valvesplumbing:

• availability: In Stock
• sold: 0
• quantity: 4
• started: May 31, 2026
• options: Ship-to-home
• best offers: True

general valvesplumbing:

• Hydraulics, Pneumatics, Pumps Plumbing > Valves Manifolds > Air Control Valves
• condition: Used

payments valvesplumbing:

• other
• wallet: Apple-pay
• credit card: Discover

shipping valvesplumbing:

Armstrong D4855 Is Similar To:

• 30-b-2 Armstrong Inch And Steam Trap Model New In Box (40% similar) Float and thermostatic type steam trap. 1/2 inch Armstrong steam trap model 30 B-2 threaded not connection mop pig map 125. In factory box...(September 11th, 2018)
• 880-1 2-150 Armstrong Trap 1-2 150 Oem (46.2% similar) We require a model and serial for any warranty replacements. All parts carry a 90 day warranty, unless shorter warranty is noted. This is required by law. All brand names and logos are property of their respective owners used for identification purpose only. The best way to is through messaging ...(February 21st, 2017)
• B2231d-5 Armstrong Stainless Steel Steam Trap Model Psi New (41.9% similar) I have done research and most of these are obsolete hard to find info on them. I have a stainless steel Armstrong steam trap model bar ATM max. I am offering best offer because don't know what these are worth. I have a large collection of belts and steam traps from local offer closed paper mill dog ...(October 7th, 2018)
• C5297-8 Armstrong 3-4-811-125 Steam Trap (53.7% similar) Three-quarter inch steam trap new old stock, box is worn...(January 16th, 2018)
• Armstrong Cd33 Disc Steam Trap 600psi 1in Npt (55.6% similar) Unsure if this has been used, it was in a box and storage for while...(December 22nd, 2024)
• Armstrong 2001csfr6 Iron Flanged Steam Trap 200psi 1-1 2in (42.4% similar) Piston valves. Valve bodies and manifolds. Roller chains. Circuit breakers. Diaphragm valves. Needle valves. Safety and security. Mounting type:flanges...(January 6th, 2025)
• Armstrong 75a3 Float And Thermostatic Steam Trap 3 4 In Threaded 75 Lb (35.1% similar) The Armstrong brand is known for its reliability and durability, making this product a trusted choice various industrial commercial applications. With a 3/4 inch threaded connection and capacity of 75 lbs, this trap is ideal for controlling the flow steam to ensure optimal performance energy ...(July 6th, 2025)
• Armstrong F t 300-911 300 911 1 2 Inch Npt Brass Wye-strainer Steam Trap Used (36.5% similar) More steam trap. Model number: 300 911. You are buying on a trap. Have a nice day. Condition: used. Please see pictures for further details...(August 17th, 2025)
• Armstrong C-638j Valve Usip (66.7% similar) Manufacturer part number: C-638J. A previously used, fully functional product that may have some signs of cosmetic wear. The product must be the original item shipped, with matching serial numbers if applicable. 2-YEAR MRI shield protection plan included. Armstrong C-638J valve manufactured by ...(October 18th, 2025)
• Armstrong 6238474 Ts-3 Angle Radiator Trap Bronze Body Usip (48.8% similar) The product must be the original item shipped, with matching serial numbers if applicable. A previously used, fully functional product that may have some signs of cosmetic wear. Manufacturer part number: 6238474. Most items are in stock when they listed. Armstrong 6238474 TS-3 angle radiator trap, ...(November 10th, 2025)
• Armstrong 75jd8trap Steam Trap Usip (67.7% similar) Specifications body material: ductile iron. Connection type: not. Armstrong 75JD8TRAP steam trap manufactured by Armstrong. Configuration: c pattern. Special instructions. Most items are in stock when they listed. Float material: stainless steel. Armstrong 75JD8TRAP steam trap float thermostatic ...(January 2nd, 2026)