well, stick to 50mm and you can get almost anything at any hardware shop.
All joints that is under gravity can be of the cheap white type available at Builders Warehouse or any hardware shop. Only joints under pressure do you need the thicker grey joints as those you will find at a pool shop (or pool section of Builders Warehouse), but they are more expensive.
@Eben, the irrigation guys call bulkheads, "tank connectors". They use it to connect pipes to the jojo plastic tanks . (Just incase they dont catch the bulkhead part, lol, i found that out the hard way)
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