Hi Guys

Does Anyone Know How To Draw This?

I'm new to the Form

I have Solidworks 2013 Version and I am trying to Create a Pump Casing.

The Pump has a 3" Inlet and A 4" Outlet

I have Pictures of the Pump that i will add..

I used a Spiral and Created a Rectangular Figure to Sweep the Path. Added a Circular 4" face and lofted the Spiral ending to a final Circular Face.

Somehow my Pump looks like a Horn

I think i am using the Wrong Approach.

I will add the part i Created Please review,

Thank You All for Your Support In Advance I do Appreciate All the Help

I Do Not know how to Empty out the Inside ( w/ The Procedure Adapted) The Part is Slimmer towards the central origin and Expands outwards to Acomodate Pressure Variations as we move outwards from the Spiral.