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Couple questions on floor drains. I've seen that a siphon can develop if your pipe extends too far past the p-trap without venting. I know there are lots of such drains without vents so is this really an issue or is there a special fix.
For those floor drains in the middle of the garage or in the mechanical room, do they need cleanouts? I ask because I've seen several drains with no cleanouts. I have seen drains with the a cleanout passage (that go to the other side of p-trap) in the side of the drain bowl. Other than one of these drains or a whole-house p-trap, what options do I have for small (2") floor drains clean-outs?