What hose for BRS 2 Part 1.1 ML Doser?

[laguest]

I need to replace the hoses on my BRS doser's.
I did buy the Drew's Dosers extension tube from BSM , but the inside diameter is only 1/8 which is smaller than what they shipped with.

What are other people using?
I have to run about 6 ft of hose from the doser to the sump. I use Alk and Calk so that would be approx 12 ft today.

Thanks