I'm not sure where you're located (I'm in the northeastern US), but Home Depot still has the A-683 available for in-store pickup: http://www.homedepot.com/p/t/100637982?langId=-1&storeId=10051&catalogId=10053&N=5yc1vZbqew&R=100637982#.Uq5IFGRDu58
The Watts A-683 piece seems to be discontinued. Anyone have any idea what a good replacement piece may be??
Be sure to stop by my page and let me know how your build goes if you do. I'd love any feedback on what you like and what could be changed- already had to add an extra hose clamp to my original design after using it for a while (I updated the build page a while back to reflect the change).