Porcher Veneto parts
Grohedal parts are cheaper than then Porcher part numbers
Grohedal
38029PIO complete fkush valve assembly
43544 piston assembly
43745 gasket
37092 water control assembly
43733 membrane, A package of 10 is <$10, whereas at American Standard parts, they charge you $19.95 for just one
Porcher Veneto part Numbers from American Standard
83081.00.000 complete flush valve assembly
83084.00.000 piston assembly
83088.00.000 gasket
83082.00.000 water control assembly
83086.00.000 membrane
Bridge mode means that the "modem" doesn't do any Level 3 processing on the traffic and passes it through, sort of like an Ethernet switch, e.g. you wouldn't see a HOP in traceroute. With the AT&T Gateway you cannot achieve a true bridge mode. The best you can do is:
For a static public subnet: the Cascaded Router (if you want to use a router to manage the public subnet)
For the dynamic public subnet: IP Passthrough (or DMZplus on the Gateways that call the feature by that name).
When configured for IP Passthrough (Passthrough Mode) the AT&T provided gateway shares its Dynamic WAN IP address with a single device on the LAN.