Q. It is common in our warm country to make the sucot on the central court yards of buildings. On those yards, sewage pipes are installed on the outside of the walls and connect to each apartment. Can a Suca be built there if those pipes will end then to be inside the Suca?
A. Suka Kehilchassa (p. 45) permits when the pipes are made of iron or other metallic substance and there is no smell at all.
However, when the pipes are of plastic material, some Poskim consider them to be similar to “klei cheres” or earthenware utensils and they prohibit reciting brochos and tefilos in front of them. (See Igrois Moshe 1: 27, Be’er Moshe 4: 7, Piskei Teshuvos 640: n. 17. and others).
Horav Shlomo Miller’s Shlit’a opinion is that in any case it is proper to cover those pipes as they provide and unsightly image to the inside of the suka.
Rabbi A. Bartfeld as advised by Horav Shlomo and Horav Aharon Miller Shlit’a