I'm putting my boiler ring together and I'm wondering about this
(http://img.photobucket.com/albums/v507/darqs/5110F8B3-007F-466B-9AE2-36F7CEE47722.jpg)
Probably a stupid question but I'm assuming I need to close that up?
Use it to control oxygen flow. With more oxy you'll get proper 'blue' flame and higher temps. Mine is fully opened.
See I thought it might be something like that but I haven't a clue really. Thanks.