Need a Blow-Off tube arrangement for the 7 gallon Fermonster

[Silver_Is_Money]

I need some ideas on blow-off tube adaptations for the Fermonster before I proceed to make a Belgian Trappist 'like' ale recipe I'm planning. I know that I can simply add a 1/4" tube to the central stem of a 3-piece air lock, but I don't think that is a sufficient solution for what I may encounter.

 

[IslandLizard]

Aside from leaving ample headspace, I wouldn't rely on the airlock stem for blow off passage either.
If there's a grommet, remove it. The hole possibly fits 3/8", 7/16" or 1/2" OD tubing directly.

 

[Silver_Is_Money]

The opening in the lid is 1.75" in diameter.

 

[sibelman]

Silver,
Home Depot has this 10-foot hunk of 1.75" OD vinyl tubing for $6.38: Model # HKP002-PVC008 Store SKU #1000017939
Internet #303132517. Also, slightly fatter 1.875" OD $7.40: Model # HKP001-PVC017 Store SKU #100001794 Internet #303209686.
Cheers.
https://www.usplastic.com/catalog/item.aspx?itemid=44409

 

[WiscoBrewerPat]

I've burst my 3 piece airlock multiple times in the past, so now I use 2 2' sections of 1.75" OD PVC tubing, connected with a 90 angle into a bucket of either vodka water or starsan. That allows the wort to breathe and saves you some/lots of cleanup