[Alessio]

Anybody see anything wrong (UPC) with this plan? Main waste is 3". Vents are 2". Yellow things are Combos. Blue thing LowHeel 90 Vent. Two Bathrooms each with sink, toilet, shower. One Kitchen sink, one drain for washing machine. Three vents penetrate roof. Drain takes a 45 degree dip and goes out front into septic system (not shown). TIA

[iamgrowler]

Anybody see anything wrong (UPC) with this plan? Main waste is 3". Vents are 2". Yellow things are Combos. Blue thing LowHeel 90 Vent. Two Bathrooms each with sink, toilet, shower. One Kitchen sink, one drain for washing machine. Three vents penetrate roof. Drain takes a 45 degree dip and goes out front into septic system (not shown). TIA

Looks good to me, but you'd do a better job of meeting the UPC's cross sectional requirements if you combined the three vents and went through the roof with a single 3" vent.

Also, I don't see any line clean-outs in your drawing.