How do I make this hollow shape solid?

[adammarkwalker]

I have this hollow object and I want to fill the insides so its a completely solid object. I can sketch and extrude to close the top an the bottom but once ive done that how do I completely fill the inside is its all one piece with no "air space" inside 

thankyou

[g-andresen]

Hi,

Try:

Boundary Fill

günther

[TheCADWhisperer]

...or Patch and Stitch.