Click to expand Tap to zoom CO2 Art 3x Washer replacement for CO2Art Pro-Series Regulators by CO2 Art Save $-10.60 $10.60 | / SKU CO2AAPSW3 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Success! We will notify you when stocks are back! There was an error signing up for restock notifications. Please try again. 3x Replacement Washer for Co2 Art Pro-SE and Pro-Elite Series, aquarium regulator.