An observation... These are L and R for sure... And that covers 99.765478% of the time (Well, approximately
!), but I'll share an experience we've had...
On a site in Newport, OR's Pacific Shores Motorcoach Resort (That we are pleased to be an owner, and love the location, location, location!!!) - an occasional 'wind' will drift in not oh so softly from/off the Pacific... And, this Pacific Northwest region, will 'sometimes' get wind and rain at the same time...
On our site. The backend of the coach faces towards the Southwest. During these wind/rain events - we've had 70-85 knot wind/rain - resulting in moisture blowing in thru the opened rear end, up thru the weep holes... And well, we've had moisture overflow from the felt track of the window.
We have an inventory of quite a few of these weep hole covers, and will continue to use them until gone. (And yeah, we use a dab of clear silicone when putting them into the weep holes too, and it helps!). For now, when heavy winds and rain are forecasted from a direction towards the back end of the coach. We put a bit of blue painter's tape on the open end. This stops the wind blowing the rain, suppose I should call it mostly horizontal rain, from blowing in and up thru the window weep holes.
I've seen, and when our stock get's low I'll try to source, weep hole covers with no open end's - just opened to the bottom. I'm 'hoping' these will not be letting wind driven rain, work it's way up thru the weep holes
!
(I've not tried to source these yet... So if they're no longer available, my apologies about being another potential option for weep hole covers!)
And a side comment. I've walked many used coaches over the years. And my experience is that if an owner has let 'multiple' (One, could be a recent fluke of RV ownership!) weep hole covers get lost and not replaced. Well, it talks about the care of the coach in general on a very inexpensive item... SO, I always look much closer when seeing this, especially on larger ticket items
!
(Slow afternoon - so not as 'brief' usual...)
Best to all,
Smitty