S/S Blanking Plug for Burst Discs This is a stainless steel blanking plug for burst discs. This plug replaces your burst disc with a thick plug that cannot blow. This allows USA valves to be used in Europe where there are no burst discs. The plug is about 4 times the thickness of our thickest disc. You should still use a plastic washer under the disc for sealing. Please note: This plug takes the safety blow out of your valve assembly. Use at your own risk.