|Name||4 in. Plastic Round Drainage Grate in Black||4 in. Drain Cap||6 in. Plastic Round Drainage Grate in Green||6 in. Plastic Square Drainage Grate in Black|
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Yes it fits directly.
Yes, you can.
It fits into both of the examples you gave. I've used the at the end of flexible 4" drains and at the bottom of an elbow. Haven't tried on tee but they should work. I went to a store and connected everything up to be sure.
Given the difference between inside and outside diameters, we can assume the wall thickness is 0.09375 inch. If we assume the item's top is the same thickness, and the overall height is given as 1.75, the interior height would be 1.65625 inches, but we can round to 3 significant digits for 1.66 inch. Now we can calculate the volume from the inside diameter of 3.75 and this interior height. A circle 3.75 inch diameter (=1.88 inch radius) has an area of pi*R^2 = 3.14*(1.88*1.88) = 11.1 square inches. Multiplied by the height of 1.66, the volume is 18.4 cubic inches. According to Google conversion, 16 fluid ounces of volume is equivalent to 28.9 cubic inches. So 18.4 cubic inches * 16 / 28.9 = 10.2 fluid ounces. What is the density of ground beef? According to the internet (https://www.chowhound.com/post/ground-beef-pound-cup-conversion-723711) it is similar to water, so 16 fl oz = 1 lb. Therefore this object should hold 0.638 lb or 10.2 weight ounces of ground beef. However if you fill the thing completely I would suggest that the shape would be too thick since when you mold ground beef patties you want them to be thin and flat, as you probably know they shrink and thicken when they cook. But it might work fine for a 1/4 pound patty or so.