| Type: | Tool |
|---|---|
| Application: | 1/2" PEX-AL-PEX 5/8" PEX-AL-PEX 3/4" PEX-AL-PEX 1" PEX-AL-PEX |

No, this tool is not compatible with Viega pex press fittings.
Yes, see the link below: http://www.supplyhouse.com/Mr-PEX-8230897-5-8-Insert-for-Manual-Press-Tool-8230895
Yes, it is compatible with MLC fittings.