I had the o-ring on the TF-R2 split on me on the 4th time I removed it, thus I ordered some O-rings for future replacement.
Below are the o-ring size that I have measured: ID*OD*CS (mm)
Part (Part Size) - O-ring Size
Drip Tip (6.25mm) - 6x9x1.5
Base to Glass (18mm) - 15x18x1.5
Cap to Glass (18mm) - 18x21x1.5
Cap to OCC/RBA (9mm) - 8x10x1.0
TF-R2 (12.5mm) - 9x11x1.0
I am getting a smaller sized o-ring for the 'cap to glass', since it is a bit loose now.
I am testing out the VMQ type of o-ring, supposely to be non-toxic. Alternative, can source for the clear type of o-ring, but the quality doesnt seem hardly enough for repetitively removal.
Update on the
OUTDATED TFV4 tank (since so many has moved on to newer toys ;p)
Used the china made VMQ o-ring for the CAP to Glass and TF-R2 for a couple of days. So far no leaks.
For the CAP to Glass, I used the 15x18x1.5 o-ring as the I find the 18x21x1.5mm kind of loose fit on the CAP which may get pinched if I dont fit the glass very very carefully.
When I used the 15x18x1.5mm o-ring, it feels much easier to fit and remove the glass from the top CAP. Initially, I was worried it might cause leaks, but so far so good.
As for the TF-R2 side, no leaks so far. Got at 50 pieces per pack at a very very cheap price from THE auction site, I can afford to change weekly and it feels tougher than the stock o-ring.