If you're looking for a way to make your SP-1000 spuds work with Large Bore Swivel Valves, look no further than the Haltec H-4000 Adapter. This adapter comes with a BW-18 washer and is perfect for use with rim slots. It's got all the essentials included - a bridge washer and a hex nut - making the process smooth and straightforward. In essence, it acts like a magic key, transforming SP-1000 spuds to work flawlessly with those bigger Swivel Valves.