Dougster
New Member
Three drains (kitchen, laundry and tub/shower) block in unison every couple of years and the clog has always been cleared at the downstream sanitary tee shown below.
It has been suggested I replace this abrupt fitting by a long sweep combo.
This seems to make sense because I can’t see any need to admit vent air upstream into the lateral drains at this location since all three upstream fixtures have their individual sanitary tees, vents and traps. I also thought san tees were only effective for short laterals or low volume waste flows.
I would appreciate comments explaining any reason not to go ahead with the change.
I’d also like to know why a sanitary tee might have been required at this location in the first place. E.g. was it a toss up between a sanitary tee and a combo in the original code and why?
BTW this is a 58 y.o. single story two bath California tract home with a basic cast iron / galvanized DWV. The building sewer out to the street may be clay or cast iron.
Thanks.
(The two views are at right angles to each other):
It has been suggested I replace this abrupt fitting by a long sweep combo.
This seems to make sense because I can’t see any need to admit vent air upstream into the lateral drains at this location since all three upstream fixtures have their individual sanitary tees, vents and traps. I also thought san tees were only effective for short laterals or low volume waste flows.
I would appreciate comments explaining any reason not to go ahead with the change.
I’d also like to know why a sanitary tee might have been required at this location in the first place. E.g. was it a toss up between a sanitary tee and a combo in the original code and why?
BTW this is a 58 y.o. single story two bath California tract home with a basic cast iron / galvanized DWV. The building sewer out to the street may be clay or cast iron.
Thanks.
(The two views are at right angles to each other):


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