If you are pumping air the Max-Air 90 Compressor is the answer. Making sure that you are pumping breathable compressed air for SCUBADiving you need to use a Grade E air Filter. The LF-1002 L-Factor disposable purification cartridge for Max-Air 35 (activated carbon, molecular sieve/hopcalite for grade "E" air) is what you need. Always have a spare available.
This product has a limited warranty of 12 months.