The mounting base, which is not exposed to sunlight is plastic.
These draw air OUT, as the vent spins by the slightest breeze.
To install, remove the top cap and undo the spindle nut. The entire rotating section will remove and leave the base plate exposed. The base plate is screwed or riveted through the 4 holes provided, and silicone or caulking compound should be added to the surface to prevent water leaks.
An optional internal cut-off vent may be added if required. Search for 'muller round'.
The corner stands are replacing like for like so I knew the qualitity is good, delivery was prompt, the first order I placed was for the short legs, once I returned them and payed the extra cost the longer legs came promptly.
Ordered a pair of roof rafters, the price suited what I was prepared to pay, there was a slight delay waiting for some out of stock parts, once that was sorted then the delivery was prompt.
I ordered a 12 volt water pump, it was in stock and shipped to my home, arrived in 2 days from memory. I installed this pump as a replacement for a older unit which had a leaking valve plate, works well.
