Sup guys.. I just built a box for a JL10W-6 I just bought. The dimensions for a ported box was 17" x 11" x 12", but the port is to be 20" long x 3" diameter. I looked everywhere for a flexport or something like that, but I can't find the right length. The longest I've found is 18" but they want $30

I thougth about PVC, but wanted to get some opinions.

What do you think?