Taso -2 powertube assembly with aluminum valve retaining screw. Small ID will result in very low velocity. See photos. Standard Nelson specs, will work on Nelspot 007, Line SI Bushmasters, Lapco pump, wintecs and other standard spec nelson pumps. Untested.
Lead time (products order to packing to shipping) is 7 to 14 days. If you are in a rush please consider ordering your rusted parts from elsewhere.