In brief: 2-inch Pentair PVC union for an UltraTemp heat pump. Pentair part number 473381.
The fitting that makes the heat pump removable
A heat pump is disconnected and reconnected each season, and completely removed for servicing. The unions on either side make these operations possible without plumbing work.
They leak when the internal O-ring hardens, and seize when the ring has been tightened with pliers. Freezing in a heat pump that was not properly winterized is another common cause of damage at this connection.
A new fitting restores the seal and provides a clean disconnect point again.
Official Pentair specifications
| Part number |
473381 |
| Diameter |
2 in. |
| Material |
PVC |
| Application |
Pentair UltraTemp heat pump |
| Genuine part |
Yes, Pentair part |
Frequently asked questions
How should I tighten the union?
By hand only. The O-ring provides the seal. Pliers deform the ring and cause the very leak they are meant to fix.
Should I drain the heat pump when closing it for the season?
Yes, completely. This prevents damage to the heat exchanger and fittings during the Quebec winter.
Can I use a generic union?
The diameter and thread pitch must match exactly. For an appliance of this value, the genuine part is the prudent choice.
Service on the North Shore
Piscines Geyser keeps Pentair parts in stock in Blainville and serves the Laurentians. Send us a photo of your setup if you’re unsure whether it’s compatible: we’ll confirm before shipping.
