To accommodate wire O-rings on the bottom, diamond tapered piston ring compressors are relieved. For standard and metric applications, there are dozens of sizes to choose from.

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ARP Ring Compressor, Tapered, Billet Aluminum, Black Anodized, 4.140 in. Bore, Each

ARP Ring Compressor, Tapered, Billet Aluminum, Black Anodized, 4.140 in. Bore, Each

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ARP Ring Compressor, Tapered, Billet Aluminum, Black Anodized, 78.5mm Bore, Each

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ARP Ring Compressor, Tapered, Billet Aluminum, Black Anodized, 4.110 in. Bore, Each

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ARP Ring Compressor, Tapered, Billet Aluminum, Black Anodized, 4.115 in. Bore, Each

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