What is the purpose of the round hole on back of cover?
1474572
The hole on the bottom back lower of the case is to let the speaker on your nook not be covered with anything to obstruct sound coming from it
1220439
Regular round works just fine. Depending on what the box is set in the light may overhang the width of it some. It did mine but I used some Great Stuff to waterproof it.
1674507
The cover is a plug. It has a ring on the back to hold the rubber plug on when it's not in use.
2042498
Actually, there is some kind of hole on a side I've never seen before. No idea what it is for. It might be it.
1277873
Inside each little cover there is a plastic ridge that fits tightly against the interior of the compartment. This ridge seems to answer for a seal to keep out moisture. (as I live in a "high desert" area, humidity is not an issue so I'm giving you my best guess).
2006054
I am not sure if I know exactly what your question refers to - the hole at the base of these is round - the shape of the outer base surround is squarish. Sorry for the non-technical description! Does that answer it?
1937494
I have no idea why it is there, not like it fits anywhere else, what I did is take the square one and put it above the round one which is held in by friction.
332660
It's structural. I'm not positive why it exists, but my guess is that it has to do with keeping tension on the back panel. You might be able to get a fingernail under it and pull it shut.
1311825
?there is a small round hole in the end where the on/odd control is..for something thin to run thru..paul
627757
There isn't a circle hole but there is a panel you can pop out (permanently or just fold it out) to run your cables through. My display covers the entire area so you cannot see the opening.
243291
I think the manufacturer tried to by making the cover sticks out about 1/16 inch all around the circle. I've had it for a long time now and it still looks new. I can't find anything negative to say about it.
498242
There is a hock at the top abov the round fill. It is for hooking the bag to the little elastic strap in the top of your camelbak which keeps it from clasping on itself in your backpack. Yes
1708880
The round hole part IS the bottle opener for the crown seal (beer) bottle caps. The serrated part possibly could be used for twist off or threaded caps but would probably crush the thinner aluminum ones.
1886253
Mainly to let heat out. With a perforated lid it still gets too hot without the bottom removed. You can get an LED bulb and leave the bottom attached if the lid is perforated properly, it puts out less light though.
2049809
it does not come with a cover plate for a wide 3 hole setting,and i could not find a suitable square one. my two extra holes now have round individual covers available at any lowe's.
1172709
I have also wondered this. And settled with the possibility that they serve no purpose outside of internally anchoring the toy holder and making it more durable. Why the holes are visible if this is the explanation, is beyond me.
118984
2 ventilation "holes" on back side, plus ventilation from bottom . When we are in Florida for the winter, Pennsylvania golf cart is left outside, protected with this cover. Never a problem. Good quality.