Ebay find for blow off

[Mr_Brewer]

hope this is in the wright spot if not please move thanks
i found these caps going to try as blow off 2lt bottle
mite help
Easy set up
Attached with high quality plastic "O" ring inside of the cap to prevent missing the Co2.
This bottle cap is very suitable to be DIY Co2 system’s accessory that the size fits common PET plastic bottle.
Package included:
1 X Bottle Cap

https://www.ebay.com.au/itm/1x-Aqua...513849&hash=item1c7ffc95fc:g:geEAAOSwuLZYzN7E

i add this for a look as well

https://www.ebay.com.au/itm/D201-Aq...705022?hash=item58fe4ee3be:g:xTEAAOSw9YNZs8N-

 

[HaveFun]

and what i do with it ?

 

[Mr_Brewer]

For cold crashing my fermenters
I am going to use the lid with a 2 or 3lt coke bottle full of CO2
And use a hose from the airlock so as it cold crashes it will suck in CO2
Through the bottle to prevent the introduction of bacteria through the air well
Hopefully it works

 

[TSMill]

Nice find....I've invested my dollar or so and will give it a go too.