Click to expand Tap to zoom CO2 Art 3x Washer replacement for CO2Art Pro-Series Regulators by CO2 Art Sold out $10.60 | / SKU CO2AAPSW3 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Chat with us Success! We will notify you when stocks are back! There was an error signing up for restock notifications. Please try again. Out of Stock? Leave your Email and we will let you know when it restocks! Notify Me! 3x Replacement Washer for Co2 Art Pro-SE and Pro-Elite Series, aquarium regulator.