Premium 1-1/2″ Barb to Union Adapter | WC122318P
Product Overview
As a retailer of hot tub spare parts, I’m offering this professional-grade adapter that transitions from a 1-1/2″ barb fitting to a 1-1/2″ union connection. This versatile component provides a secure transition between different connection types.
Technical Specifications
| Specification | Detail |
|---|---|
| Model Number | WC122318P |
| Size | 1-1/2 inch |
| Connection Types | Barb to Union |
| Material | Chemical-resistant thermoplastic |
| Design | Straight adapter |
| Style | Transition fitting |
Exploded parts diagram: This part is shown as item #8 on the Sand Filter, Waterco, Thermoplastic Series Top Mount exploded parts diagram.
🔧 Sand Filter, Waterco, Thermoplastic Series Top Mount – exploded parts diagram

The numbered parts below make up this assembly. Parts we stock are linked – click any to view.
| No. | Part |
|---|---|
| – | Pressure Gauge, 1/4"mpt, 0-60psi, Bottom Mount, Generic |
| 10 | Half Union, 1-1/2", with O-Ring |
| 9 | Tailpiece, 1-1/2" Barb, black |
| 8 | Adapter, 1-1/2" Barb x 1-1/2"union ◀ this part |
| 7 | Clamp Ring, Waterco Thermoplastic |
| 6B | Multiport Valve, Waterco Top Mount,1-1/2"fpt, Clamp-On,6 Pos |
| 6A | 30-252-W009K6A |
| 5 | Drain Assembly, Waterco Micron SM/Thermoplastic |
| 4 | 31-252-1115 |
| 3 | 30-252-W009K3 |
| 2 | 30-252-W009K2 |
| 1 | 30-252-W009K1 |
Key Features
- Matching 1-1/2″ size on both ends
- Precision-engineered barb design
- Professional-grade union connection
- Chemical and UV-resistant construction
- Secure sealing system
Installation Benefits
- Simple installation process
- Reliable barb grip
- Secure union connection
- Optimal flow characteristics
- Versatile application
Applications
- Pump connections
- Filter systems
- Equipment hookups
- System transitions
- Plumbing modifications






