US $520.00

The Titan O2 has all the same great features as the standard Titan plus:

Designed and built for oxygen percentages between 40–100%.   This, coupled with its excellent reliability, makes it the ideal regulator for shallow water, high O2 percentage decompression stops

The Titan O2 has undergone rigorous adiabatic compression testing and is built in a dedicated cleanroom to ensure that it is suitable for higher percentage oxygen applications

The green yoke knob and front cover clearly identify it as a dedicated, oxygen cleaned regulator 

WARNING:

Do not attempt to use this product with enriched air until you obtain training in nitrox use with mixtures containing greater than 40% O2 by volume, from a nationally recognized training agency.