Start by determining your awning's manufacturer. There should be a tag sewn in on the underside of the awning fabric. Should have the model/part number listed. Then just do a search for related awning parts. As stated, this is a common part and shouldn't be hard to locate a replacement.
'07 K3500 Silverado LT Crew Duramax (LBZ)
2016 Salem 27RKSS
1984 CHEV SCOTTSDALE K20 2GCGK24J0E1XXXXXX (Chevrolet Legends-Class of 2019)
"...exhaust fluid? We don't need no stinkin' exhaust fluid"