I am tying together cast to abs under a existing concrete slab that will be filled back in. My ? is, can I burry a cast to abs union? If so, do i need to use the one with the metal sleve around it? Please reply asap.
Looks like you are in a similar situation I was in. Check out this thread for additional information from the advice I was given- note the size of cast iron may be a tad smaller than the pipe you are joining it to- you may want to measure first before making the purchase.