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New one would be best. But be aware that many of eBay ones won't fit. Notice there's certain length of tubing to place petcock well below mounting surface of tank (about 8cm). So far, none of vacuum petcocks i've seen on eBay will fit. The tubing section is too short and petcock hits overhanging side of tank.
There appears to be manual petcock that may work, but I haven't asked them for any measurements yet.
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