Discuss the scuba diving equipment, gear & accessories.
Discuss Buoyancy Control Devices (BCD) such as jackets, wings, backplates, etc.
Discuss the things that monitor your status or keep you pointed in the right direction.
Discuss wet suits, dry suits, gloves and hoods.
Discuss those things that deliver your air.
Discuss underwater lighting.
Discuss mask, fins and snorkels.
Discuss building or servicing your own gear.