There is this additional pipe in the toilet which no one had a clue what it was for. Can we get rid of it? Who else better to ask than HDB? I couldn't find a contact point for renovation questions so I tried the general email contact: hdb@mailbox.hdb.gov.sg . I don't think I have had much good experience with emailing to general enquiry of any organisation to talk about. In this case, I too, have forgotten about it as soon as I sent it. The email was sent on a Friday night at almost 10pm. The following Tuesday morning, I got a call at 9am from Don, a representative from HDB saying he would be in my unit at 11am to have a look. Don was there at 11am. After surveying, he said it is part of sewage pipe system from older design. Only a some units in certain floors have it and I was one of the lucky ones. And no, it cannot be dismantled. One working day, one officer on site, question answered, doubt cleared. I am left with t...