Seal, AL Crimp, 20mm, w/Retaining Ring, PTFE/Red Rubber, 0.137" 100/PK : 405 042: $39.30: Seal, AL Crimp, 20mm, PTFE/Gray Butyl, 0.129" 100/PK : 405 054: $90.47: Seal, AL Crimp, 20mm, PTFE/Molded Gray Butyl, Pharmafix: 100/PK : 405 062: $68.10: Seal, AL Crimp, 20mm, w/Retaining Ring, PTFE/Silicone, 0.130" 100/PK : 500 272: $70.86