fits my machine perfectly
i have ordered two and both where correct
Replacement Water Chamber (LG34510) designed for the Luna G3 CPAP/APAP, G3 BPAP 25A CPAP, and G3 BPAP 30VT machines. The humidifier may reduce nasal dryness and irritation by adding moisture (and heat if applicable) to the airflow. Fill the water chamber with approximately 360 mL of water. Distilled water is recommended.