1" TwistFlow Manifold (6 Outlets) Zoom

1" TwistFlow Manifold (6 Outlets)


Brand: Caleffi

Qty Price
/ each
$795.90 / box (2 units x $397.95)
In Stock! Ships in 24-48 Hours
(6 Available)



Number of Outlets: 6
Supply Size: 1"
Max Pressure (PSI): 150
Max Temp (F): 180°F
Media: Water or Glycol up to 50%

Description for Caleffi 6686F5S1A

Series 668S1 TwistFlow pre-assembled distribution manifold for radiant panel systems with built-in sight flow gauge/balancing valve

Distribution manifolds for radiant panel systems are used to optimally distribute the heating fluid in floor heating system circuits and ultimately improve the control of heat emission from the panels. The manifolds ensure that the flow to each circuit is regulated precisely and also control the shut-off, venting and automatic removal of air from the system.

  • 1" NPT inlet ball valves
  • Maximum working pressure: 150 psi (10.3 bar)
  • Maximum temperature: 180°F (82°C)
  • Maximum peak temperature: 200°F (93°C)
  • Loop Cv: 1.23 (combined supply & return ports)
  • Outlet center distance: 2 inches

This manifold requires (6) Loop Fitting Assemblies:

PEX Loop Fitting Assemblies Options
PEX-AL-PEX Loop Fitting Assemblies Options
Optional Installation Accessories:

Loop End Cap
If you want to use your manifold to heat multiple zones, you can purchase return side actuators that work along side thermostats. The actuators act as zone valves to allow you to use one manifold to control the temperature in different rooms independently.
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1" TwistFlow Manifold (6 Outlets)

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2 Questions | 2 Answers
Displaying questions 1-2
  • 1" TwistFlow Manifold (6 Outlets)


    Are the 1/2" PEX adapters included or do I need to purchase them separately? P/N 680504A?
    Are the 1" inlets NPT only? Any adapters included?
    Are thermometers included? Can you provide P/N if not?

    Asked on 10/19/2013 by Greg

    1 answer



      Pex adapters must be purchased separately. 680504A is the correct fitting for standard 1/2" pex. The supply and return inlets are 1" NPT and can be adapted from there to meet your needs. The thermometers are optional, and are part number 688003A. They attach to the supply and return valves.

      Answered on 10/21/2013 by PexSupply Staff from NY
  • 1" TwistFlow Manifold (6 Outlets)


    What fitting is required to connect to Rifeng 1/2 Pex-Al-Pex? Is it 682540A or 680504A?
    Asked on 10/4/2013 by Mike from Steamboat

    1 answer



      682540A should be used for Pex-Al-Pex.

      Answered on 10/4/2013 by PexSupply Staff from NY
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