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Home Made Bait / Yabbie Pump

Parts:

I bought my parts from Bunning's Warehouse North Kempsey, and have shown their pricing to give a guide. Prices may vary with location and availability.

Part Product Barcode Price Qty Total
50mm PVC Pipe x 1 meter 9319841030680 $9.00 1 $9.00
Threaded Rod M8 8mm x 1 meter 9310086560925 $5.05 1 $5.05
50mm PVC Pipe Push On Cap 9323714047613 $1.98 1 $1.98
40mm PVC 45 Corner Pipe 9323714046203 $1.98 1 $1.98
8mm Wing Nut 9314453098356 (2pk) $2.20 2 $2.20
8mm Hex Nut   $0.24 2 $0.48
8mm Metal Washer   $0.24 2 $0.48
Fix-A-Loo Flat Suction Washers* 9312232226136* $0.50 6 $3.00

Total:

$24.17
*Note: The Washers I used were on special/run out for $0.50, and were marked down from ~$3.00ea. So I bought 6.
So long as the washer used is 50mm in diameter, then it should work with these plans. See details below for more info.
These ones are marked "Suits Brass & PVC 'A' Type Outlets"

Instructions:

1. Drill an 8mm hole through the center of the 45 corner pipe on the outer side of the bend.

2. Screw on one of the Hex nuts, attach the 45 corner pipe to the threaded rod and screw on the second nut (as pictured). Tighten both nuts to hold the 45 pipe in place.

3. I drilled a 10mm hole through the PVC cap. I made this bigger than the threaded rod so that it didn't cause friction/grind the rod along the hole when it is pulled/pushed through it. However, making a bigger hole may cause too much air to get into the pipe. This will be determined upon testing, Once done, push cap onto threaded rod, as pictured.

4. Thread a Wing Nut and Metal Washer onto the threaded rod, with the wing facing 'up' the thread (towards the PVC cap).

5. Thread the Rubber Suction Washer onto the threaded rod, and follow with another Metal Washer and the other Wing Nut (this time facing 'down' the rod).

6. Tighten the Wing Nuts to hold the Rubber Washer in place. As you can see, when I tightened the Wing Nuts, the washer bended considerably (making it less than 50mm, and not causing any suction within the pipe). To counter this, I added a couple of extra rubber washers to give more hold within the pipe and hopefully this will work. A larger metal washer may also hold it flatter, as would a different Rubber (thicker Washer or different shape - as noted above, I bought these specific ones because they were on clearance).

7. Feed the Threaded Rod into the PVC Pipe and fix the PVC Cap to the end of the pipe (as pictured), and you are done!

Finished DIY Bait Pump:

Notes / Things I Still Need To Test:
- As you can see, it is quite large (1m in length). The pump can be shortened by simply cutting both the PVC Pipe and the Threaded Bolt to a shorter length.
- The reason for using Wing Nuts around the washers is so that, if necessary, you can carry spare washers and replace them as needed, without the need for a spanner or pliers.
- Upon a quick 'sucking water out of a bucket' test, the pump did well, however, whilst sucking water up, it quickly released the water again as air got into the tube via the opening in the PVC Cap (and past the rubber washers). This may be trial and error until I determine what works best as far as the washers go, and I can always get another Cap through which I can drill a smaller hole.
- As PVC can be quite thick, if it doesn't drive into wet sand to easily, I may need to file the edges of the bottom end of the pipe to make them a bit sharper.
- If needed, I will work out a way to attach a handle to the pipe. Bolting another small piece of pipe to the side should do the trick.

If you like my DIY Bait Pump, please consider a small donation..
                                   
Any questions, comments or ideas, please let me know!

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