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The Western Enterprises MB-70 is a brass-style manifold block that connects several gas pigtails to a single line, listed for argon, helium and nitrogen service. It is worth considering if you want to feed a shielding-gas line from more than one cylinder. Skip it if you only use one cylinder at the torch, because a regulator and flow gauge are all you need.
Western Enterprises MB-70 at a Glance
| Item | Per the listing |
|---|---|
| Type | Gas manifold block with female outlets |
| Gases listed | Argon, helium, nitrogen |
| Connections | Female outlets for pigtails with CGA connections |
| Size | About 15.2 x 11.6 x 12.4 cm |
| Weight | About 1.7 kg |
| Verify | Pressure rating, thread types, gas service |
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What It Is and Who It Suits
A manifold lets two or more cylinders feed one supply line, usually through flexible pigtails that attach to the cylinder valve and to the block. When one cylinder runs low you can switch to the next without stopping work. That is useful for shops with steady shielding gas demand or for lab and process setups using nitrogen or helium.
It suits small shops building a fixed gas station, makers who share argon between two machines, and technicians who maintain inert gas lines. A single hobby welder rarely needs it.
How to Check It Fits Your System
- Gas service: Make sure the gas you use is on the rated list. Inert gases are listed, fuel gases and oxygen are not.
- Connections: The outlets are female and take pigtails with CGA connections. Check the pigtail end and the thread type, size and gender before ordering.
- Pressure rating: Compare the rating with your cylinder pressure; full cylinders can be 2,000 PSI or more.
- Check valves: Each cylinder leg should have a check valve so one cylinder cannot back-feed another when it is disconnected.
- Mounting: A block is heavy for its size, so plan a secure mount near the cylinders, away from impacts.
- Regulation: A manifold block does not regulate pressure. You still need a regulator downstream or at the end of the line.
Pros and Limitations
Pros
- Lets several cylinders feed one line for longer run time.
- Compact enough for bench or wall mounting.
- Standard CGA pigtail connections on the outlets.
Limitations
- Needs pigtails, check valves and a regulator, which add to cost.
- Not for oxygen or fuel gas unless the manufacturer rates it so.
- The listing gives no pressure rating, so verify before use.
Install and Safety Tips
- Chain cylinders upright and keep them away from heat.
- Use only fittings and hoses rated for your gas and pressure.
- Open cylinder valves slowly and leak test every joint with soapy water.
- Use check valves and a pressure-relief device if your system design needs one.
- Do not mix oxygen and fuel gas equipment on the same block.
- Have a qualified person review a fixed system, since local codes may apply to piped gas.
Alternatives and Related Guides
- For a single-cylinder argon regulator, read the Miller 30 Series flow gauge regulator review.
- See the dual-output argon regulator flow meter review for a two-outlet regulator alternative.
- For fittings, check the Riverweld argon quick connect review.
- To compare a basic flow meter, see the HTP argon/CO2 flow meter review.
Frequently Asked Questions
What is a manifold block used for?
A manifold block joins several gas cylinders into a single supply line through pigtails, so you can feed one regulator or piping system from multiple cylinders. It is common in shops that use a lot of shielding gas and want longer run time between changes.
Which gases is the Western Enterprises MB-70 listed for?
The listing names argon, helium and nitrogen, which are inert or non-flammable gases. Do not use a block with oxygen, acetylene or other fuel gases unless the manufacturer rates it for that gas, and never mix equipment between oxygen and fuel service.
Does the MB-70 come with pigtails?
The listing describes female outlets that accept pigtails with CGA connections, and the text does not suggest pigtails are included. Confirm the exact fittings and whether you need adapters, check valves or a separate regulator for your cylinder connection.
What pressure rating should I look for?
Check the pressure and temperature rating printed on the block or in the manufacturer data sheet. It should exceed your maximum cylinder pressure and system pressure. If the rating is not shown in the listing, ask the seller before building a system around it.
Verdict
The MB-70 is a specialized part for multi-cylinder inert gas setups. Confirm the pressure rating, fittings and gas service on the current listing before building a system around it.
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