This is a brand new muffler. The specs are as follows:

•  Premium version of B1SB1277.
OD     4.2"
Height     3.275"
Intake Port     1.25" ID
Threads     1" male

Replaces part numbers:

AET10410     JOHN DEERE
008227     GRAVELY
105-122     STENS
20033200     ARIENS / GRAVELY
20033200     GRAVELY
21375300     GRAVELY
21457900     GRAVELY
236649     KOHLER
275679     KOHLER
275679-S     KOHLER
299477     BRIGGS & STRATTON
32043B     TECUMSEH
35-006     OREGON
372644     AYP
392989     BRIGGS & STRATTON
393232     BRIGGS & STRATTON
8001     ROTARY

Thanks for looking!!

B1SB8001