The brass pieces I use are adapters and barbs. Nylon is not better than brass, they both work fine as can be seen if you follow my projects or have one of my reactors; as with most other things it is a matter of preference. Some fittings are hard to locate, PM me if you need fittings or a reactor. There are several folks using this type of reactor (I will make you one for cost/shipping plus a lb. of starbucks, it includes a mount, check valve, extra bio balls, CO2 probe mount if you want the DC2 model and CO2 tubing). Use loctite on brass, teflon tape on pvc. I also use all purpose glue for the pvc joints instead of the convential purple crap.......DC
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