Spare air mini breather, this is the 300 model in luminous yellow.
All the information can be found here Spare Air Models - 300 Standard & Nitrox and Model 170 plus Part and Accessories
The box is faded but it has never been used, these retail for around £180 will sell for £100
All the information can be found here Spare Air Models - 300 Standard & Nitrox and Model 170 plus Part and Accessories
The box is faded but it has never been used, these retail for around £180 will sell for £100