The first stage with a balanced diaphragm is the F400 from Ocean Pro. No matter the depth, the balanced regulator has been designed to give you optimal breathing performance. For cold-water dives or dives in murky waters, the environmental seal safeguards the first stage from freezing and contamination.
For the best custom hose routeing, the F400 offers 2 high-pressure ports and 4 low-pressure ports. Your regulator’s configuration can be chosen, and it can be modified to suit your preferences. Use either regular air or Nitrox (which is compatible with 40% O2) when diving. available in DIN or Yoke variants.
This is the first stage, which is appropriate for experienced divers and anyone looking to buy high-quality items at a low price.