The Caleffi NA669150 is a replacement sight flow meter (1/4 - 1 gpm) for Caleffi TwistFlow radiant distribution manifolds, restoring per-loop flow indication and balancing on the supply manifold.
Product data compiled from Caleffi North America technical documentation (01170 NA, 01155 NA). Last reviewed July 2026.
Key Features
Sight Flow Meter, 1/4 - 1 gpm
Replacement PSU sight-gauge flow meter reading 1/4 - 1 gpm for direct visual loop balancing.
Per-Loop Balancing Restored
Renews flow indication on a TwistFlow supply-manifold outlet after wear or damage.
Tool-Simple Swap
Replaces the existing meter body on the manifold outlet without removing the manifold.
Technical Data
| Function | Manifold / mixing station service part |
|---|---|
| Flow meter scale | 1/4 - 1 gpm |
| Body | PSU sight gauge |
| Metric scale | 1 - 4 l/min |
| Maximum operating pressure | 87 psi (6 bar) |
| Medium temperature range | 41 - 176 F (5 - 80 C) |
Documentation
Technical brochureRelated Products
Frequently Asked Questions
Caleffi TwistFlow radiant distribution manifolds - it replaces the sight flow meter on a supply-manifold outlet.
1/4 - 1 gpm, on a visible PSU sight gauge used for loop balancing.
No. The meter body replaces on the outlet with the manifold in place.
- Type:
- Accessory
