Delavan 38745-001 DA-1.5 Brass Siphon Air Atomizing Nozzle
For Waste Oil & Heavy Oil Burner Applications
🔥 Product Overview
The Delavan 38745-001 DA-1.5 Siphon Nozzle (also referred to as DA-1.5 or 38745-1) is a heavy-duty brass air-atomizing nozzle engineered for burning waste oils, used oils, and high-viscosity fuels.
Designed for stable atomization at low air pressures, the DA-1.5 produces a solid cone, ultra-fine spray ideal for waste oil heaters, industrial burners, and any system requiring consistent atomization of thicker fuels.
With its 8 psi air requirement, 0.50" oil lift, and approx. 1.465 GPH flow rate, the DA-1.5 is a proven performer for demanding waste oil burner systems that need clean, clog-resistant operation.
✅ Key Features
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✔️ Designed for waste oil & high-viscosity fuels
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✔️ Brass body for durability and corrosion resistance
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✔️ Low-air-pressure atomization (8 psi)
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✔️ Clog-resistant design with large internal passages
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✔️ Produces ultra-fine, solid cone atomization
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✔️ Stable 80° spray angle
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✔️ Ideal for industrial burners & waste oil applications
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✔️ Low CFM requirement for efficient performance
📊 Specifications
| Specification | Value |
|---|
| Model |
DA-1.5 |
| Part Number |
38745-001 (also seen as 38745-1) |
| Body Material |
Brass |
| Air Pressure |
8 psi |
| Oil Lift |
0.50" |
| Approx. Flow Rate |
1.465 GPH |
| Spray Angle |
80° |
| Spray Pattern |
Solid cone, fine atomization |
| Fuel Compatibility |
Waste oil, heavy oil, high-viscosity oils |
| Design Type |
Siphon air atomizing nozzle |
| Clog-Resistant |
Yes, large internal passages |
| Typical Application |
Waste oil heaters, industrial burners |
⚠️ Common Symptoms of a Failing Waste Oil Siphon Nozzle
If your burner uses a DA-1.5 and is experiencing issues, symptoms may include:
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❌ Delayed ignition or no ignition
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❌ Smoky or dirty flame
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❌ Excessive soot buildup
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❌ Poor atomization or “spitting” fuel
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❌ Increased fuel consumption
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❌ Unstable flame pattern
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❌ Frequent burner lockouts
If you observe these signs, replacing the nozzle is often the first step.
❓ Frequently Asked Questions (FAQ)
Q: Is the DA-1.5 the same as the SNA series?
A: They are similar in concept but the DA series is designed specifically for very high-viscosity oils and features larger passages for clog-free operation.
Q: Is the 38745-001 suitable for used/waste oil?
A: Yes — it is engineered for waste oil and heavy oil burners.
Q: What air pressure does this nozzle require?
A: 8 psi for proper atomization.
Q: Can the spray angle or flow change?
A: Spray angle and droplet size can vary slightly based on air pressure, lift, and system conditions.
Q: Is this interchangeable with DA-1.0 or DA-2?
A: No — each DA nozzle has a specific flow capacity and operating range.
🛒 Shopping Tips
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✔️ Always match flow rate (GPH) and spray angle to your burner’s requirements.
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✔️ Replace siphon nozzles regularly — waste oil contains particulates.
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✔️ Confirm your burner’s air pressure matches the nozzle’s 8 psi spec.
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✔️ If your waste oil is especially thick or dirty, the DA series is the best choice.
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✔️ Keep a spare nozzle on hand to minimize downtime.
