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TheVillageIdiot
02/04/2007, 12:29 PM
I wanted to duplicate the dosers you can buy at the fish store, but I didn't want to spend quite that much, and I like to make things.

I didn't have a bulkhead, so I decided to make one with PVC parts at my local hardware store. I don't know that what I came up with would work in high pressure situations, but it works just fine for the 2.5g my doser holds.

Anyway, Here's a shot of what I used to make the doser and some information on the parts below:

http://i26.photobucket.com/albums/c129/MattTVI/DIY/Doser/Components2.jpg

List
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IV - this might be hard to get if you don't live around a vet or know someone who works in the medical field. I was able to get a used Salene IV from a local vet (w/ out the needle). I cut the bag off.

Needle Barb - this (already in the IV in the picture) is a 3/8" x 1/2" threaded hose barb. I inserted the 3/8" part into the IV. It is a tight fit, but elbow grease does the job

1/2" Female Adapter - standard sch40 pvc

1/2" Male Adapter - same as above

1/2" Female Cold Water Adapter - this is not standard it is in the cold/hot area of the plumbing section. I used this to complete the bulkhead because it threads much nicer. You can see the "washer" inside of it. I used a small screwdriver to pop that out.

1/2" 90d Elbow - this is used so that the "drip counter" on the IV unit works, it has to be upright.

O-Rings - available in the faucet repair section, the #17 fit the 1/2" PVC nicely

3g Rubbermaid Roughneck - in the storage section!
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Because the IV dripper was free, the total cost for this system was less than $10.00, tax included.

TheVillageIdiot
02/04/2007, 12:34 PM
Okay, after cutting out the IV, I then drilled a hole in the roughneck.

I wanted the hole to be off the base of the unit because of the settling that takes place in kalkwasser.

http://i26.photobucket.com/albums/c129/MattTVI/DIY/Doser/RoughCut.jpg
the hole is drilled using a 3/4" bit, 7/8" may be TOO BIG, but the 3/4" was a pretty tight fit.

I initially put an o-ring only on the inside of the roughneck, but that leaked, so I put one on both the inside and outside of the bulkhead. No leaks now.

Here are the bulkhead components:
http://i26.photobucket.com/albums/c129/MattTVI/DIY/Doser/MaleFemale.jpg

Here is the female part installed.
http://i26.photobucket.com/albums/c129/MattTVI/DIY/Doser/FemIn.jpg

I didn't screw too tightly as the o-ring begins to misbehave, so you have to be careful between screwing it too loose or too tight.

Here it is put together:
http://i26.photobucket.com/albums/c129/MattTVI/DIY/Doser/Installed.jpg

And here it is during the testing stage:
http://i26.photobucket.com/albums/c129/MattTVI/DIY/Doser/Together.jpg
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Well, that's all there is too it. I took about 30 minutes to put together and cost less than $10.00 (USD). It's a very simple, very easy thing to do.

hope you like it,

Matt

JustOneMoreTank
02/10/2007, 08:47 PM
Nice job and very cheap to make!
:)