Specifications include, but are not limited to: Vendor to exchange empty welding gas cylinders with full cylinders on an "as needed" basis upon GRDA's request Cylinders to include: 1. Oxygen 200 + CF, Size 2, K Size Cylinder. Per cylinder, yearly estimate of 30 cylinders. 2. Acetylene: 130 + or CF (Med). Per cu/ft, yearly estimate of 3,000 cu/ft. 3. Argon 300 + CF, Industrial Size 30. Per cylinder, yearly estimate of 10 cylinders. 4. Nitrogen: 200 + CF. Per cylinder, yearly estimate of 10 cylinders. 5. Oxygen: Small, OX 20. Per cylinder, yearly estimate of 10 cylinders. 6. Acetylene: Small, AC3. Per cylinder, yearly estimate of 5 cylinders 7. Argon Carbon Dioxide mix (25% Carbon Dioxide/ 75% Argon), yearly estimate of 4 cylinders