Hi Bob:
Don’t buy a bathmate. I have one, It is a glorified and expensive toy. You need a pump with a pressure gauge to do this properly and safely, as Titlest noted.
I will come back later with some links to an air set-up, including a pump with a gauge that can be used for either air or water pumping.
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Ok this is the pump I am talking about. It is the pump I use. This store is in the US, but I believe I have seen similar brass Brake Bleeder Kits on eBay Australia for around $50.00 Australian dollars. You can also by such a thing at your local auto parts store.
Please follow the link so you can see the picture.
Brake Bleeder and Vacuum Pump Kit
On sale, $21.99 US
It has a reservoir cup you put inline between the pump and cylinder. So
Pump———>reservoir———->cylinder.
The cup catches any excess water that gets pulled out of the cylinder, which keeps the pump from getting damaged.
This is a brand name pump w a gauge I found on eBay Australia. It is plastic contruction, but I know it is highly recommended by cock pumpers
Mityvac 8000:
MityVac 8000 Automotive Tune-up and Brake Bleeding Kit | eBay
Around $42.00 AU
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In addition to a pump you will need a cylinder and a hose with a male connector.
LeLuv is a US eBay vendor but they sell on eBay Australia as well.
Here are links to a cylinder and a hose on eBay Australia:
LeLuv acrylic cylinder:
I am guessing the right size cylinder will cost around $40.00 AUD.
See this thread for picking the right size for your cock:
Selecting Your Cylinder Size
LeLuv hose and connector:
Hose and Fitting O-ring Male for LeLuv Penis Nipple Vagina Vacuum PUMPS 12 Inch for sale online | eBay
Around $9.00 AUD for the hose.
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Total approximate cost: $91.00 AUD plus shipping