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Here's the complete video:
If you'd like a step by step instructable, read on:
For the Blood Shooter Rig
1. Small tube of quick set epoxy.
2. A length of 1/2" diameter PVC pipe. (3in should do the trick.)
3. Plastic 1/4-turn release valve, with 1/2" female thread on both sides.
4. PVC adapter from 1/2" slip to 1/2" male thread.
5. Nylon bushing from 1/2" thread to 3/8" thread.
6. Brass bicycle valve adapter from 3/8" thread to...uh..bicycle.
7. 5' length of 3/8" inner diameter (ID) flexible hose.
8. Nylon adapter from 3/8" barbed to 1/2" male thread.
9. Nylon 3/8" barbed elbow joint.
10. Tiny rubber bands (found in the hair accessories isle)
11. Plastic wrap.
12. Empty 2-liter soda bottle.
For the Blood
1. Corn Syrup
3. Red Food coloring
Step 1: The Air Tank
Next using a bunch of epoxy bond the other end of your PVC pipe to the end of your empty 2-liter soda bottle. Make sure and use enough epoxy to make this strong and air tight! Also I noticed that different brands of soda have minor differences in the diameter at the top of the bottle. Out of the handful I tried, Pepsi bottles seemed to fit the PVC pipe the most snug.
Congratulations you've just made the heart and soul of your blood shooter! Easy huh?
Step 2: The Blood Hose
Next take your 5 feet of clear hose (being clear makes it easier to see how much blood you have in there) and attached your modified elbow to one end and the 1/2" threaded adapter in the other.
Step 3: The Filling Adapter
Step 4: Making Blood
Step 5: The Set Up
First open the valve on your air tank and screw on the filling adapter.
Any bike pump will fit our adapter. I haven't done a PSI test, but with my bike pump I could get a good 16 pumps in. Once you've filled the air tank, close the valve and unscrew the filling adapter. My rigs leak a little while pumping, but stops as soon I close the valve. Now your tank is ready to go.
Step 6: Sealing the Elbow Joint and Filling the Hose
Secure the plastic wrap with one of the tiny rubber bands and trim the excess wrap with a pair of scissors. This seal needs to be tight enough for the blood not to leak but weak enough to pop off when we open up the air tank.
Using a funnel fill your blood hose with, well blood! My philosophy on blood...more is better. Position the elbow joint on your actor wherever you want blood to be spilt!
Step 7: Attaching the Blood Shooter to the Actor
Get a loose fitting shirt at Good Will. I've found a plaid, light colored button up number is best. You'll need to carefully pre-cut the shirt where the blood is shooting out. A little "X" along the pattern of the shirt will be hard to see on video.