First Mac sorry about that outburst last night mate it wasn't warranted so if you want to :violence-smack: feel free.
Ok so the RC has to be 4" then so be it I'll make it that length and I'll be using 1/2" pipe so should get a few in there. I tried silver soldering the 1/4" with propane and found noway would the silver solder flow so went back to bunnings and bought some mapp gas not bloody thinking my propane burner is the wrong one for the mapp gas as usingthe mapp still couldn't get the solder to flow. I am using what I have onhand and that is 45% silver solder. Next week I'll get an actelyene bottle of my mate then I'll use oxy for doing the soldering of the easy flanges. If I'm not happy with the result I'll just bite the bullet and save some cabbage and go with Mac's easy fittings.
Yummy there is an unknown O-ring just past the lockin plates and I still need to measure the ID past the O-ring and I do reckon it will be a sliding fit with the 4". So if it is I'll cutoff the locking plate then silver solder the 4" in just to be sure to be sure.
Well todays effort pretty well sucked with me only making one site glass copper piece and wasting 1/2 of the day driving to find stuff then the rest trying to silver solder the ring
Anyway as promised
The under side thats seals has been filed totally flat then painted with texta and put on my surface table with some 400 grit paper. Once i do the 1/4" ring that will get done again. also by the looks I'll have plenty of 3 and 4" left over so if any SA based guys want to do a 4" I'll be happy to work a deal and pass it on.
Cheers Bryan
Edit: I forgot to say before, last night the guys that cameup are SS tig welding guru's And we spoke about the keg need a fill port and drain. The first thing he said I'll have to purge it then we spoke more on the fill port. I did mention I need to get a 4" tri clamp of mac and he said get that and he will make the fitting to suit. Now where one would love to go with one of Mac's 2400 watt heating elements being off the grid here lets do some maths, on 240 volt thats 10 amps and drawing 2400 watts out of my inverter will mean 100 amps out of the batteries, so if a run say takes 4 hours I'll endup with one flat battery bank so I'll be going with a decent gas burner.