I bought some earlier this year to match the dimensions of the Gravity Games sacs that Supra's use. Total cost including shipping was $286 compared to $700 for the GG sacs. They are holding up great. Like sacdeep said, they use the regular waterbed fittings. However, I got around this by finding some plumbing fittings at the hardware store that go inside the sac fitting rather than screwing over it. I put a clamp on the outside of the sac fitting to make a tight seal around the plumbing fiting that goes inside the sac. The quick connect fittings on my ballast system connect to the fittings I attached to the inside of the sacs. It works like a charm with no leaks what so ever and I saved $400 to boot!
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