SKU: CYLN AL M4 Category: Refurb Cylinders Tags: aluminum, cylinder, m4, oxygen, refurb Description Description Item # CYLN AL M4 Call 866-446-8765 for pricing and availability. Related products System One Remstar Plus 60 CPAP DS260TS Read more Refurbished Aluminum M22 Cylinder Read more Refurbished Aluminum M90 Cylinder Read more Refurbished Aluminum M6 B Cylinder Read more