Shop Parts › Merge Collector Image 1 of 1 Merge Collector $135.00 Nice stainless steel merge collector for DIY builders. 1.500” primary tubing is slip fit into the bottom. 1.800” exit. Quantity: Add To Cart Added! Nice stainless steel merge collector for DIY builders. 1.500” primary tubing is slip fit into the bottom. 1.800” exit.