Genuine CAT 310-3953 O-Ring Seal Genuine Caterpillar O-ring using on various hard pipes as O-ring sealing ends. Suitable for intake and aftercooler systems. 3512C 3516 3512 3508 3126B 3512B C9.3 C9 C7 Genuine CAT 310-3953 O-Ring Seal MSRP: Was: Now: $94.63 Add to Cart