121370170 ST-49 Sewer Nozzle – 1/4" NPT, Size #4.5 (1F-3B)

Model / Part Number: 121 370 170
Category: Pressure Washer Accessories → Sewer & Drain Jetter Nozzles
Type: Fixed Sewer Jetter Nozzle – 1 Forward / 3 Back (1F-3B)

The 121 370 170 ST-49 Sewer Nozzle (1/4″ NPT, Size #4.5) is a heavy-duty fixed jetter nozzle designed for professional sewer and drain cleaning applications. Featuring a 1 forward jet and 3 rear-facing jets, this configuration provides strong penetration power while maintaining effective propulsion and pipe wall flushing.

Jet Configuration (1F-3B)

• 1 Forward Jet – Breaks through grease, sludge, scale, and compacted debris

• 3 Rear Jets – Propel the hose forward while flushing loosened material back

• Fixed Spray Pattern – Reliable, consistent cleaning performance

This balanced configuration makes it ideal for both penetrating and flushing operations in residential and light commercial sewer lines.

Technical Specifications

• Model: ST-49

• Part Number: 121 370 170

• Inlet: 1/4″ NPT

• Jet Pattern: 1 Forward / 3 Back

• Orifice Size: #4.5

• Maximum Pressure: Compatible with high-pressure sewer jetting systems

• Application: Sewer & drain cleaning

Key Features

• ST-49 1/4″ sewer jetter nozzle

• 1F-3B jet configuration

• #4.5 orifice size

• 1/4″ NPT drain cleaning nozzle

• High-pressure sewer cleaning accessory

• Balanced penetration and propulsion design

• Ideal for professional pressure washer jetting

Ideal Applications

• Main sewer line cleaning

• Residential and commercial drain maintenance

• Grease and sludge removal

• Preventative sewer flushing

• Higher flow jetting systems

⚠ Sizing Note:
A #4.5 orifice must match your pressure washer’s GPM output to maintain correct operating pressure and optimal performance.