I have for sale a barely used MA957 regulator. I had purchased it for a 5 lb tank for a smaller aquarium and have recently upgraded everything to a much bigger size and it is extra. The regulator works well and no issues with it. Minor scratches on the connecting piece to tank but no other issues. I will also include some co2 tubing. Please pm me for questions or anything else. (Price is plus shipping - I will get you the best packaged and cheapest shipping possible) Sells for a hundred or more new and many threads here are either damaged or more expensive. Thanks!