123065188 ST-49 Sewer Nozzle – 3/8" NPT, Size #4.0 (1F-3B)
Model / Part Number: 123 065 188
Category: Pressure Washer Accessories → Sewer & Drain Jetter Nozzles
Type: Fixed Sewer & Tube Cleaning Nozzle – 1 Forward / 3 Back (1F-3B)
The 123 065 188 ST-49 Sewer Nozzle (3/8″ NPT, Size #4.0) is a professional-grade fixed jetter nozzle built for high-flow sewer and drain cleaning systems. Featuring a 1 forward jet and 3 rear-facing jets, this configuration delivers effective clog penetration while maintaining strong propulsion and pipe wall flushing.
Jet Configuration (1F-3B)
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1 Forward Jet – Breaks through grease, sludge, and compacted debris
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3 Rear Jets – Propel the hose forward while flushing debris from pipe walls
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Self-Propelling Design – Back pressure powers forward movement
This balanced design makes it suitable for both blockage removal and general line cleaning.
Technical Specifications
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Model: ST-49
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Part Number: 123 065 188
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Inlet Connection: 3/8″ NPT
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Orifice Size: #4.0
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Jet Pattern: 1 Forward / 3 Back
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Maximum Pressure: 4200 PSI
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Application: Sewer & drain cleaning
Key Features
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ST-49 3/8″ sewer jetter nozzle
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#4.0 orifice drain cleaning tip
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1F-3B jet configuration
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3/8″ NPT high-flow sewer nozzle
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Self-propelling drain cleaning design
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Rated up to 4200 PSI
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Ideal for professional pressure washer jetting systems
Ideal Applications
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Commercial drain cleaning
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Larger sewer line maintenance
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High-GPM jetting systems
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Grease and sludge removal
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Preventative sewer flushing
Why Choose the 3/8″ Inlet?
A 3/8″ NPT inlet supports higher flow rates and is typically used with larger jetting rigs or trailer-mounted pressure washers.
⚠ Important: Always match the #4.0 orifice size to your machine’s GPM rating to maintain proper PSI and prevent equipment damage.
