Fitting
Size
Code
Roof Outlet Large Diameter Flat for most surfaces
3″
4″
2170.3G
2170.4G
Roof Outlet Large Diameter Domed For most surfaces
3″
4″
2171.3G
2171.4G
Balcony Outlet  for Screed finish
3″ 2172.3G
Blanking Cap For 2172 & 2174 3″
9995.3
Balcony Outlet For Asphalt Finish
3″ 2174.3G
Balcony Adaptor
(Reducer)
3″ x 21/2″ 2173.3.25G
Roof Outlet Small Diameter Flat
2″
3″
2180.2G
2180.3G
Roof Outlet Small Diameter Domed
2″
3″
2181.2G
2181.3G