A jump liner (28 for a push-pull MIG welding torch includes an elongated tubular body (30) having front and back ends (32, 34). The tubular body (30) is made of a flexible plastic material. A front adapter (38) is disposed at the front end (34) of the tubular body (30). The front adapter (38) is fitable in a retaining head of the torch. A back adapter (40) is disposed at the back end (32) of the tubular body (32). The back adapter (40) is fitable in a gooseneck or body block of the welding torch. The front adapter (38) provides sealing (48) between the jump liner (28) and the retaining head to prevent back flow leakage of shielding gas, and the front adapter (38) prevents deformation of the tubular body (30) at elevated temperatures. The back adapter (40) provides sealing between the jump liner (28) and the gooseneck or body block.
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