however in this embodiment a perforated heavy walled pipe 40 replaces both the extension tube 12a and perforated pipe 20 in the embodiment shown in fig1 also a cylindrical screen 42 is shown surrounding the pipe 40 to prevent debris from entering the pipe the pipe is shown threadedly connected to the adapter but it may be welded or joined by any other suitable means the collar 14c is threadedly connected with reverse threads to the adapter 16c so that the adapter can be removed with the drive rods after the device has been driven into place at the opposite end to the connection to the pipe 42 the collar is provided with internal threads which may be as shown in fig5 and 6 to enable drop pipe 22 to connect to the collar 14c and be in fluid communication with the fluid passage section e g perforated pipe 40 drive rods may be connected to the adapter 16c as shown in this configuration after the drive rod 18 and adapter 16c are removed the drop pipe 22 will remain attached to the collar 14c and in fluid communicating relationship with the interior of the perforated pipe 40 the fig1 embodiment also shows how a standard drive point may be retrofitted with a collar to enjoy the.