123065189 ST-49 Sewer Nozzle – 3/8" NPT, Size #8.5 (1F-4B)

Model / Part Number: 123 065 189
Category: Pressure Washer Accessories → Sewer & Drain Jetter Nozzles
Type: Fixed Sewer & Tube Cleaning Nozzle – 1 Forward / 4 Back (1F-4B)

The 123 065 189 ST-49 Sewer Nozzle (3/8″ NPT, Size #8.5) is a high-flow, professional-grade jetter nozzle engineered for demanding sewer and drain cleaning applications. Featuring a 1 forward jet and 4 rear-facing jets, this configuration delivers aggressive penetration, enhanced propulsion, and expanded pipe wall cleaning coverage.

Jet Configuration (1F-4B)

• 1 Forward Jet – Breaks through heavy grease, sludge, ice, and compacted blockages

• 4 Rear Jets – Increase propulsion and improve wall flushing performance

• Self-Propelling Design – Back pressure powers the nozzle through the line

Compared to 1F-3B models, the additional rear jet provides stronger thrust and more even debris removal.

Technical Specifications

• Model: ST-49

• Part Number: 123 065 189

• Inlet Connection: 3/8″ NPT

• Orifice Size: #8.5

• Jet Pattern: 1 Forward / 4 Back

• Maximum Pressure: 4200 PSI

• Application: Sewer & drain jetting

Key Features

• ST-49 3/8″ sewer jetter nozzle

• #8.5 high-flow drain cleaning tip

• 1F-4B jet configuration

• Heavy-duty 3/8″ NPT inlet

• Self-propelling sewer cleaning design

• Rated up to 4200 PSI

• Ideal for commercial and industrial jetting systems

Ideal Applications

• Large-diameter sewer lines

• Commercial and municipal drain cleaning

• High-GPM trailer or skid-mounted jetting systems

• Heavy debris and sludge removal

• Long pipeline runs requiring maximum thrust

Why Choose the #8.5 Orifice?

The #8.5 orifice is intended for high-output machines requiring greater water volume. It delivers increased propulsion and more aggressive cleaning action in larger pipes.

⚠ Important: Always match the #8.5 orifice size to your machine’s GPM rating to maintain correct operating PSI and avoid pump damage.