OP43 Burst Disc For HPA & Co2 OP43 $6.00 3K - CO2 - $6.00 1.8k - HPA - $6.00 5k - HPA - $6.00 7.5k - HPA - $8.00 4.5k - HPA - $6.00 6.7k - HPA (for UN marked 4500 PSI cylinder regs) - $8.00 Quantity This variant is currently sold out We may not keep this item in stock. Please fill in the form below and we will let you know availability! Replacement burst disk for your co2 or HPA tank .