The kit also minimizes the amount of oxygen used for calibration, which is a necessity with small cylinders. The head only calibration kit consists of an inlet cap with a standard BC QR fitting to plug in the manual addition oxygen hose and an exhaust cap fitted with a mushroom valve. The simple to use head only calibration kit allows the canister to be thoroughly flushed with oxygen for calibration and the mushroom valve helps to prevent calibration errors resulting from over pressure. The calibration cap set can also be used as dust caps.

This calibration cap set fits the O2ptima Classic head fittings for chest mount (CM) or over the shoulder (OTS) counterlungs. It will not work with the back mount counter lung (BMCL) design.