Straight-seam pipe is smoother and therefore avoids any buildup in crevices that is more likely to occur with spiral pipe.  Hercules carries this Snapolock Pipe in not only 3 foot lengths but other sizes as well.

Specifications: 

SKU Description Prod Info Price/Units Quantity
18243 18" 24GA SNAPLOCK PIPE 3' Product_Details FT
20243 20" 24GA SNAPLOCK PIPE 3' Product_Details FT