Bradford White TTW URG2PV75H6N Instructions Manual page 14

Venting continued-
CONNECTION TO 3" (7.6 CM) CONNECTION TO A 3" (7.6 CM) TO
VENT PIPE 4" (10.2 CM) REDUCER
Figure 2
IMPORTANT
All of the Venting connections must be leak checked with a soap and
water solution upon initial start up of the water heater. Any leaks must
be repaired before continuing operation of the water heater.
14