Delavan 38745-002 DA-2 Air Atomizing Siphon Nozzle

Waste Oil / High-Viscosity Oil Atomizing Nozzle
Replaces Reznor 107310 & 56975-6

⭐ Product Overview

The Delavan 38745-002 DA-2 Air Atomizing Siphon Nozzle is a heavy-duty, high-viscosity waste-oil nozzle engineered for reliable atomization under challenging burner conditions. Built for commercial waste-oil heaters, this nozzle provides cleaner combustion, reduced clogging, and stable flame performance thanks to Delavan’s oversized internal passages and DA-series design.

This model is the exact replacement for Reznor OEM part numbers 107310 and 56975-6, and is used in Reznor RA and RAD series waste-oil heaters.

🔧 Specifications

🔄 Compatible With

This nozzle is used in the following Reznor waste-oil heater models:

• RA110 / RA-110

• RAD110 / RAD-110

• RA140-H / RA-140H

• RAD140-H / RAD-140H (High Altitude)

OEM Replacement For:

• Reznor 107310

• Reznor 56975-6

✔️ Key Features (With Green Check Marks)

• ✅ DA-Series High-Viscosity Performance – Designed for thick waste oils where standard atomizing nozzles fail.

• ✅ Large Internal Passages – Minimizes clogging and supports low-volume flow stability.

• ✅ Precise 80° Spray Pattern – Promotes efficient combustion and cleaner burn.

• ✅ Exact Fit Replacement – Direct OEM replacement for multiple Reznor part numbers.

• ✅ Stable Atomization at Low Air Pressure – Operates reliably at 8 psi air with 0.50" oil lift.

• ✅ Proven in Commercial Waste-Oil Heating – Trusted for RA and RAD series heaters.

⚠️ Symptoms of a Failing or Clogged DA-2 Nozzle

If you notice any of the following, the DA-2 nozzle likely needs replacement:

• Uneven flame pattern or flame-out

• Excessive smoke or soot buildup

• Burner struggling to ignite

• Poor or inconsistent heat output

• Oil smell or incomplete combustion

• Nozzle making popping or spitting noises

• Visible carbon deposits on nozzle face

❓ Frequently Asked Questions (FAQ)

Q: Is this the exact replacement for Reznor 107310?

Yes. The Delavan 38745-002 DA-2 is the direct replacement for Reznor 107310 and 56975-6.

Q: Can this nozzle burn standard #2 fuel oil?

It can, but it is specifically engineered for waste oils and high-viscosity fuels, where standard nozzles struggle.

Q: What airflow pressure does this require?

The nozzle operates at 8 psi air and a 0.50" oil lift.

Q: Does this help reduce clogging?

Yes — the DA-series design uses large internal passages to decrease clogging and improve reliability.

Q: How often should the nozzle be replaced?

For waste-oil systems: every season or every 700–1000 hours, depending on fuel quality.

🛒 Shopping Tips

• Always confirm your heater model to ensure compatibility.

• Inspect your old nozzle for DA-2 marking to verify replacement accuracy.

• Replace filters and strainers at the same time for best performance.

• Keep a spare DA-2 nozzle on hand—waste oil systems can clog unpredictably.

• Pair with clean, dry compressed air at 8 psi for correct atomization.