Small bathroom drain plumbing advice - vents.

[michkrom]

Hi,

I have a bathroom plan that would connect:
sink --> shower --> WC --> main

This is a horizontal projection: the waste lines will have some horizontal parts not shown here.

For a convenience of vent location I'd prefer 1 and 2 but these may not be in code (vent of horizontal drain behind waste line connections?).

The 3 seems code-ok (?) if the san/wye T under the WC is possible?

/\
:
:
:   Lv-e
:      |   Sh-e     WC
:      |      |     |
E------T------T-----T----main

/\
:
:
:   Lv-e
:      |   Sh-e     WC
:      |      |     |
E------T------T-----T
                    |
                    \----main

/\
:
:
T- Lv
|     Sh-e     WC
|       |      |
E-------T------T
               |
               \----main

Any advice? I am IRC.

Regards,

Newbie Michal