First of all, you need to decide which size elbow you are going to work with. 1/2" elbows are the cheapest, and generally run 70-85 cents a piece, depending on where you buy them. If you are using 1/2" elbows, you will need a 3/4" drill bit or hole saw. Why is that? The reason is that the outside diameter of the screw-in elbow will fit inside a 3/4" drilled hole. The 1/2" measurement on the elbow refers to the INNER diameter of the elbow, not the OUTER.
I like to use two ventilation elbows in these gourds when using either 1/2" or 3/4" screw-in 90 degree PVC elbows. Do NOT use unthreaded elbows! You may think that you can drill the hole wide enough to accommodate a regular elbow, and you may think you can glue it into place, but the moment it is dropped and lands on that elbow, it will pop right off. Save yourself the trouble and use threaded, screw-in elbows from the start!
Gourds should have ventilation features added to them, if they do not already come that way (as in the case of BO-11Ps with cooling caps). On this page, I will show you how to add 1/2" and 3/4" elbows to a Supergourd, but this same method could be used with any plastic gourd.Supergourds are great gourds, and as far as plastic gourds go, are quite well-made. However, when the outside temperature gets into the mid and upper 90's and above, this gourd can get quite hot inside when hung as-is, and oftentimes, baby martins will show heat stress by panting and spreading out in the gourd.
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