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)
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1 Forward Jet – Breaks through grease, sludge, scale, and compacted debris
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3 Rear Jets – Propel the hose forward while flushing loosened material back
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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
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Model: ST-49
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Part Number: 121 370 170
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Inlet: 1/4″ NPT
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Jet Pattern: 1 Forward / 3 Back
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Orifice Size: #4.5
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Maximum Pressure: Compatible with high-pressure sewer jetting systems
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Application: Sewer & drain cleaning
Key Features
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ST-49 1/4″ sewer jetter nozzle
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1F-3B jet configuration
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#4.5 orifice size
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1/4″ NPT drain cleaning nozzle
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High-pressure sewer cleaning accessory
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Balanced penetration and propulsion design
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Ideal for professional pressure washer jetting
Ideal Applications
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Main sewer line cleaning
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Residential and commercial drain maintenance
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Grease and sludge removal
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Preventative sewer flushing
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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.