What timing on this post. I washed off the roof of my Surveyor over the weekend, and a big chunk of the black tank vent cap came off while I was washing it. By the time I got the vent cap off of the flange, much of it was in tiny pieces. I bought 2 new caps at a local RV dealer today (might as well replace the gray tank vent cap also), and when I started to pull the vent cap off of the flange, the dealer said let it be, and replace the whole thing. He added that if the vent cap is that brittle, then the flange is probably also. He had a good point. Hopefully the screws will line up wit the new flange, so I can use the old holes.
Those 2 vent caps cost me all of $1.95 ea.
Chap , DW Joy, and Fur Baby Sango
2017 F350 Lariat CCSB, SRW, 4x4, 6.7 PS
2017 Grand Design Reflection 337RLS