Perfect for LS2 GTO. The heater bypass valve at the factory broke so I tried to assemble a loop from the parts store to temporarily bypass the entire heater loop. The loop I put together didn't fit well as it had to be so big due to the size adapter in the middle. This loop snapped right in, eliminating the extra attachment I previously needed, and it fits the water pump snugly and snugly. No leaks and reusable factory clamps.
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