Shop - Big Wave Surf Gear › Discount pack: 4 x 38gr CO2 canister Image 1 of 1 Discount pack: 4 x 38gr CO2 canister Sale Price: $67.50 Original Price: $90.00 4 x 38gr 3/8 tread marine grade CO2 canisters for big wave surfing inflation vests. Quantity: Purchase Added! 4 x 38gr 3/8 tread marine grade CO2 canisters for big wave surfing inflation vests. You Might Also Like Quick View 38gr Co2 cartridge 3/8" $22.50 Quick View 25gr Co2 cartridge 3/8" $20.00