1610B large white
1610N large black
1610GR large grey

1612B small white
1612N small black
1612GR small grey

Round inspection plate

Large: Ø12.3 external, Ø10.4" hole
Small: Ø10.4 external, Ø8.2" hole

1620B large white
1620N large black
1620GR large grey

1622B small white
1622N small black
1622GR small grey

Round inspection plate with lock

Large: Ø12.3 external, Ø10.4" hole
Small: Ø10.4 external, Ø8.2" hole

1611B white
1611N black
1611GR large grey

1621B white with lock
1621N black with lock
1621GR grey with lock

Round hatch with box

Hole: Ø10.4" x 11.3" deep

4477B small white
4477N small black

4478B medium white
4478N medium black

4479B large white
4479N large black

Inspection hatch cover with O-ring

Small: Ø4.2" external , Ø5.8" external
Medium: Ø5.2" external , Ø6.8" external
Large: Ø6.2" external , Ø8" external

4577B small white
4577N small black

4578B medium white
4578N medium black

4579B large white
4579N large black

Inspection hatch, self centering thread with O-ring

Small: Ø4.3" external , Ø6.5" external
Medium: Ø5.3" external , Ø7.5" external
Large: Ø7.5" external , Ø8.9" external