3B Medical 28434639781984 One-time purchase: Subscribe & save (5%): Deliver every 6 Months Subscription details x How subscriptions workProducts are automatically delivered on your schedule. No obligation, modify or cancel your subscription anytime. Learn more... Qty. 1 2 3 4 5 6 7 8 9 10 Add to Cart Replacement Water Chamber for Luna Heated Humidifier is currently on backorder. You may still purchase now though and we'll ship as soon as more become available. Replacement water chamber for Luna CPAP and APAP heated humidifiers. Recommended replacement schedule: every 6 months.