71649 H.B. SMITH 2" x 6" WNA for Return Drum
The H.B. Smith 71649 Weld Nipple Assembly (WNA) is a precision-engineered component designed for use on Mills 450 and 650 H.B. Smith Boilers. This 2" x 6" assembly is used for return drum applications and includes all necessary hardware for a secure and durable installation.
🌟 Key Features
✅ Complete 2" x 6" Weld Nipple Assembly for return drum applications
✅ Includes locknut, split Hy-Temp seal with string, and split washer
✅ Two-piece nipple design — beveled for welding
✅ Designed for high-temperature hydronic and steam applications
✅ OEM replacement part ensures proper fit and reliability
✅ Compatible with Mills 450 & 650 H.B. Smith Boilers
⚙️ Technical Specifications
| Specification | Details |
|---|
| Brand |
H.B. Smith |
| Part Number |
71649 |
| Description |
2" x 6" Weld Nipple Assembly (WNA) |
| Application |
Return Drum |
| Compatible Boilers |
Mills 450 & 650 Series |
| Included Components |
WRN 2" x 6" (74229), Split 2" Hy-Temp Seal with String (72001), 2" Locknut (71604), Split 2" Washer with Rivet (60302) |
| Design |
Two-piece nipple, beveled for welding |
| Function |
Creates a secure, high-temperature return connection |
🔧 Kit Includes
❓ Frequently Asked Questions (FAQ)
Q1: What does WNA stand for?
➡️ WNA stands for Weld Nipple Assembly, a connection component used on boiler return drums.
Q2: Which boilers does this assembly fit?
➡️ It fits Mills 450 and 650 Series H.B. Smith Boilers.
Q3: What’s included in the kit?
➡️ It includes the weld nipple, locknut, split Hy-Temp seal, and split washer — all OEM components.
🛒 Shopping Tips
💡 Always confirm your boiler model (450 or 650 Series) before ordering.
🔧 Ensure proper alignment and welding practices during installation.
✅ Using genuine H.B. Smith parts ensures compatibility and system longevity.
