3/8 in. Single Barb Union Tee
Sizes in This Series
Brass single-barb union tees. Jump to another size or add it straight to your cart:
| Size | Part # | Price | Cart |
| 1/4 in. | 21151 | $8.99 | Add to cart |
| 3/8 in. (this page) | 21155 | $1.97 | — |
Overview
The MPN 21155 is a 3/8 in. brass single-barb union tee with three identical mini-barb hose ends. It splices and branches a 3/8 in. flexible hose line into a tee without threads, clamps optional. Solid brass construction gives it strong corrosion resistance for water, air, fuel, and light oil service.
Technical Specifications
| Part Number (MPN) | 21155 |
| Configuration | Single Barb Union Tee (3-way) |
| Barb Size (all 3 ends) | 3/8 in. |
| Connection Type | Mini Hose Barb x Mini Hose Barb x Mini Hose Barb |
| Material | Brass |
Materials of Construction
| Body | Brass |
| Finish | Natural brass |
Typical Applications
Used to tee or branch 3/8 in. flexible tubing and hose in low-pressure water, compressed air, fuel, lubrication, and instrumentation lines. Common in equipment plumbing, small engines, washer-fluid and coolant routing, and aquarium or pump bypass loops where a barbed slip-on connection is preferred over threaded fittings.
Cross-Reference and Interchange
This brass barb union tee cross-references to these competitor and industry part numbers: 07064-04, 07064-06, 07072-0404, 1064X4, 1064X6, 1064X6-CT, 224-6, 29MBT-4, 64DB-4, 9646, 964-6, D4646, D464-6. Replacing one of these? Match nominal barb size, configuration, and material, or send us your part number and we will confirm the interchange.
Sizing and Installation Resources
FAQ
What hose ID does the 3/8 in. barb fit?
It is sized for 3/8 in. inside-diameter flexible hose or tubing. Secure each end with a clamp for pressurized service.
Are all three ends the same size?
Yes. All three barb ends are 3/8 in., so a single hose size connects on every leg of the tee.
Does it need thread sealant?
No. The connections are barbed, not threaded, so no Teflon tape or pipe dope is required.
Is brass okay for potable water?
Standard brass is fine for general water and air; for potable applications confirm local lead-free requirements.
⚠ WARNING: This product can expose you to chemicals including lead, known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.