Viega ManaBloc overview

Viega ManaBloc series manifolds offer innovative homerun hot & cold water distribution solutions for any home size in a compact and easy to install package. They are constructed from durable, corrosion resistant and lead-free polymer and are available with 1/2" or 3/8" ports with compression, press and crimp style connectors to accommodate any type of PEX tubing. All ports (branches) feature 1/4-turn style, replaceable and color-coded (red and blue) valves, with a valve key included in every package.

A ManaBloc manifold has (2) cold water main supply ports (1 on top and 1 on bottom) and (1) hot water inlet port. The secondary cold water supply can be used to run the pipe to the next manifold where needed, or can be capped off using supply end cap. It also allows for easier connection where hot and cold supply lines run from different directions.

What’s included:

Each ManaBlock manifold set includes the following:
  • ManaBlock manifold
  • Port (branch) side outlet adapters of selected size and connection type - 3/8" or 1/2" in PEX compression, crimp or press.
  • Valve key (to open and close individual ports; attaches to the manifold to prevent accidental loss).
  • Sticky labels to mark individual ports.

Additional required or recommended parts

  • Supply adapters which allow to connect the main hot and cold water supply lines to the ManaBloc. These are available in 3/4" and 1" sizes in male NPT, crimp, press and compression styles.
  • Supply end cap is almost always used to cap off the secondary cold water inlet.
  • ManaBloc compression nut wrench is recommended when installing a compression style manifold.
  • Port caps can be installed on unused outlet ports as a secondary safety measure against accidental leaks.
  • Mounting straps set allows for easy installation of the ManaBloc between 16" OC (on-center) studs.
  • A couple spare outlet port adapters may prove useful if the connection was done improperly or if a quick repair is needed.
We also recommend using mounting straps and/or bend supports to secure the PEX outlet lines in place prior to connecting them to ManaBloc. This will reduce stress on the ports and will help to prevent leaks.

Frequently Asked Questions

Q: Which connection system is best - crimp, press or compression?
A: For those who have neither experience not tools for crimp or press methods, Compression style manifold would be the optimal choice. PEX Crimp method has been in use the longest comparing to press and compression and has proven to be very reliable. Viega Press method should be the choice when the rest of the PEX plumbing system is connected with press fittings and tools.

Q: What are the advantages of the ManaBloc over DIY manifold set.
A: The main advantage is convenience, which makes installation quicker and easier. Practically the same system can be made with Sioux Chief copper manifolds with brackets - at a comparable price.

Q: What size are the supply inlet connections on ManaBloc?
A: The connections are 1", however the thread is not NPT and will not accept any other adapters other the Viega supply connectors.

Q: When connecting PEX to ManaBloc, should the pipe be connected to the adapter first or adapter to manifold first?
A: For PEX crimp and press adapters, the pipe must always first be connected to the adapter. With connection made, the adapter is then connected to the manifold. The reason is that when crimping or pressing with a tool, a substantial amount of force is exerted and if the adapter is secured to the manifold, both adapter and the manifold may crack or break off. This is not an issue with compression style connections since they employ a 1-step process instead of a 2-step one.

Q: Can ManaBloc be used for hot water recirculation.
A: No.

Q: What’s the pressure/temperature rating?
A: 180 F° @ 100 psi