Parts List with prices and shipping estimates:
[attachment=0]Cost Summary-TAD DIY Tap-rza.png[/attachment]
Part Sources -
4 Twist-It rubber stoppers - auspexscientific.com
Stopper 5 pk $3.99
Stopper Shipping $7.50
Luer connectors, McMaster Carr #'s follow - you can sometimes find these on Amazon, but availability is spotty. I have some of each type on hand to make it easy to adapt back and forth, so I built my taps with a consistent flow using Males as outputs, Females as inputs, but you could stick with just Female 1/8" and Male 1/4" to reduce the number of styles to order.
Barbed, Female Nylon
Tube ID Pkg. (10)
1/8" 51525K213 $3.51
1/4" 51525K216 $3.86
Barbed, Male Nylon
Tube ID Pkg. (10)
1/8" 51525K123 $3.96
1/4" 51525K126 $4.43
These parts from Tap-A-Draft direct ( http://www.sturmanbg.com/tap-a-draft/purchase ):
Molded Cap $1.73
And the bottle itself, from NB or TAD direct:
6-Liter Brown Bottle comes with standard cap. $6.83
I got these from US Plastics, shipping was ~ $7 for these small, light parts.
64046 Each $0.79 1/8" PP Standard Check Valves << I use on gas side of tap
64048 Each $0.73 1/4" PP Standard Check Valves << You might want on your gas source?
Or if you just want to adapt from 1/4" or 3/16" ID line to the 1/8" ID hose (not certain these are food grade?):
64275 Each $0.46 Black Nylon Reduction Couplers 1/4" x 1/8" Tube ID
64370 Each $0.53 Natural Polypropylene Reduction Couplers 1/4" x 1/8" Tube ID
I buy the 1/8" x 1/4" PVC tubing (7001P) from a local True-Value HW store ~ $0.27/ft, it is rated food grade for beverage and is made by
http://www.samarinc.com/samar/pages/sam ... atalog.pdf
7001P - Samar’s versatile Clear Vinyl Tubing can be used for beverage dispensing, potable water, laboratory tubing, drain lines, water transfer, and numerous low pressure applications. It is light weight, yet tough and abrasion resistant. The CVT’s PVC compound is in compliance with FDA CFR TITLE 21 requirements, and meets USDA, 3A, and NSF51 criteria.
You could use these QDs from Colder Product Corp. in place of the check valve and Luer on the gas side. Here are the PNs from US Plastics for all the combos of male/female 1/8" and 1/4" hose barbs:
64166 In-Line Hose Barb Insert
PMC Series Acetal Shut-Off Insert Hose Barb Fitting 1/8" Flow; 1/8" ID Each $5.52
64154 In-Line Hose Barb Body
PMC Series Acetal Shut-Off In Line Hose Barb Fitting 1/8" Flow; 1/8" ID Each $5.77
64168 In-Line Hose Barb Insert
PMC Series Acetal Shut-Off Insert Hose Barb Fitting 1/8" Flow; 1/4" ID Each $5.52
64155 In-Line Hose Barb Body
PMC Series Acetal Shut-Off In Line Hose Barb Fitting 1/8" Flow; 1/4" ID Each $5.77
And TAD also sells a Mini-Keg adapter, which might be able to be used with this tap design, but I have not tried it and don't know:
Adapter to use Tap-A-Draft dispenser with a 5-L mini keg. Adapter fits into standard bung on mini-keg. Bung not included. $7.76
Note on CO2 source: If you don't have a full CO2 tank and regulator, there are a couple options.
Option 1) Some people use the little trigger operated Soda Keg CO2 Charger, you'd just need to add a tire-stem (air tank valve at my local HW store) to the gas in-line. Note that these are not regulated, so I think they are somewhat risky - you need to shoot just enough to increase the pressure for a good pour. I've never used them, so cannot comment. But they are pretty cheap and portable.
http://www.northernbrewer.com/shop/soda ... arger.html
Option 2) I'll put up a thread and a link later, but I've got a DIY design to use with a paint-ball tank. Less than $10 and easy to construct, and while it does not use an actual regulator (which is what makes it cheap), it is basically self-regulating, and very easy to pump a bottle back up to serving pressure (10 - 15#), and can get to 30# for soda water. Paint-ball tanks are ~ $20, and refill is about $4. Much cheaper than using cartridges, though the tank will need to be replaced or hydro-tested after 5 years.