This will depend on which size standpipe you wish to use and where your bulkhead is in relationship to the overflow chamber walls. Off center bulkheads have more room for a standpipe than centered bulkheads.
For Durso Standpipes built for 1 inch bulkheads, approximately 5 inches (13cm) is needed from the back of the tee to the front of the street-ell and 2 inches (5cm) width.
For Durso Standpipes built for 1 ½ inch bulkheads, approximately 5 ½ inches (14cm) is needed from the back of the tee to the front of the street-ell and 2 ¼ inches (5.7cm) width.
If you have a small overflow chamber and a Durso Standpipe will physically fit in your chamber, but you think the standpipe will not line up to the bulkhead we offer Durso Standpipes made from flexible PVC to allow enough movement of the pipe to reach the bulkhead.