Same thing
By cutting it out and installing either a P trap or a running trap as an S trap is notorious for losing its seal
Evaporation is the most common, syphoniage due to no vent or a block went is another cause or a leaking trap.
Two inches
50mm
Same thing
By cutting it out and installing either a P trap or a running trap as an S trap is notorious for losing its seal
Check your flame trap first for a clogged trap.
2"
They can also require to have a self primming trap
fill it up with clean clear water to replenish the seal
A net fishing rod by hands a spear by boat a trap
trap seal loss or poor venting
Trap seal loss occurs when you have poor venting and as one fixture drains it creates negative pressure created and it pulls the trap seal (water) from another trap and allows sewer gases to enter the structure
Evaporation is the most common, syphoniage due to no vent or a block went is another cause or a leaking trap.
Just enough to reach the crown weir to prevent fumes from passing through the trap seal
2" to maintain trap seal