The L-5 lance works very well with the BP-4, producing a very fine spray, excellent for both pesticide and PGR applications.
To use this, the L-5 handle and valve are not needed. The extension and the ring may be purchased without these parts as part number L-5E.
Assemble the extension lance and ring in place of the standard lance on the BP-4 or replace the nozzle with the L-5 ring to use without the extension portion.
Visit the BP-4 page
to view a video of the L-5 Lance working with the BP-4