For some reason the photos are upside down here, but rightside up on my computer. Hmmm.
I needed a hand-powered water pump for a kid's toy, but the hardware store version cost $30 and was the wrong size. This one costs around $10, depending on what scrap supplies you have lying around.
The basic problem is to make two "check valves" as cheaply as possible. These are 1-way valves, in this case operated by superballs I liberated from the kids' toy basket.
Here's your parts list, most bought from Home Depot. Total cost: $10.47.
- 1 1/4" x 1/2" PVC bushing, screw type on 1/2" end (2)
- 1 1/4" PVC Tee (1)
- 1 1/4" x 1" PVC bushing, pressure fit both ends (1)
- 1 1/4" x 1/2" PVC bushing SPGXS (1)
- 1/2" x 3/4" PVC male adapter SXMPT (1)
- 1 1/4" PVC elbow (1)
- 1 1/4" x 2' PVC pipe
- superballs, small enough to fit inside 1 1/4" PVC pipe with some room to play (2)
- dowel rod or square wood rod to serve as plunger, as large as possible to fit easily inside 1 1/4" PVC pipe
- rubber or rubberized foam source to seal plunger. I cut up an old foam floor mat. An old sandal would work, too.
- screws to hold superballs and plunger seal in place (3)
- Optional: PVC primer and cement, depending on how permanent you want your pump to be
Step 2: Secure balls in place
1/2-way through the T and the elbow worked well for me.