Roof Vent Caps

[coffeeman]

On my Bighorn 3600RL-2009 I have 5 vent caps. 4 have a screw to hold in place and the pipe appears to be 2 1/2 inches. The fifth is much larger and I don't know how this cap is removed, also the pipe seems to be larger. I want to replace the caps and 4 seem to be straight forward however I don't know what to replace/remove the larger one with. Txs

 

[TandT]

Look here, VENT_CAP. Trace

 

[coffeeman]

Look here, VENT_CAP. Trace

Txs that is it. Found in Florida for $10 and snap in caps for the others. Never realized there was an attic vent. Learn something every day.