R & D Racing Products Pro-Lock Power Plenum 200-00143 Lock onto more air/fuel velocity with R&amp;Ds Pro-Lock Power Plenum Quickly removable for spontaneous carb adjustments Unique all-rubber base is mechanically bonded to a massive all-metal, free-flowing, non-absorbent element topped with a CNC-machined billet aluminum anodized lid on dual and triple models Must use Pro-Lock adapters unless otherwise noted