The Caleffi NA669250 is a replacement sight flow meter (1/2 - 2 gpm) from the Caleffi 669 series, supplied for legacy Caleffi 663-series and earlier 668-series manifolds. It is NOT the meter fitted to current 668S1 TwistFlow manifolds or 172-series mixing stations - those take the 1/4 - 2 gpm F69600. Order this part only to match an existing 1/2 - 2 gpm meter.
Product data compiled from Caleffi North America technical documentation (01170 NA, 68367, NA11012, SS-103 NA) and the Caleffi North America product catalogue. Last reviewed August 2026.
Key Features
Sight Flow Meter, 1/2 - 2 gpm
Replacement PSU sight-gauge flow meter reading 1/2 - 2 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 | Legacy 669-series flow meter (663 / earlier 668 series) |
|---|---|
| Flow meter scale | 1/2 - 2 gpm |
| Body | PSU sight gauge |
| Maximum operating pressure (meter) | 87 psi (6 bar) |
| Medium temperature range (meter) | 41 - 176 F (5 - 80 C) |
Documentation
Technical brochureRelated Products
Frequently Asked Questions
Legacy Caleffi 663-series and earlier 668-series manifolds. Current 668S1 TwistFlow manifolds and 172-series mixing stations use the 1/4 - 2 gpm F69600 instead. Confirm the scale printed on your existing meter before ordering.
1/2 - 2 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
