NE-CAV-RO-A O-ring, retaining, Aegis, Specialty NMR Sample Tubes, Controlled Atmosphere Valve (CAV) Sample Tube, Pressure Valve (PCAV) Sample Tube, CAV / PCAV Spare PartsRetaining O-ring, Aegis.For use with ketones, aldehydes, ethers or aliphatic esters $54.70 Qty: Add to cart