We offerous : 
- Non pressure manlids unassembled - with external fastening (Page 6)
- Assembled round manlids not suitable for pressure or vacuum (Page 7&8)
- Round external lids Ø 500 and Ø 600 (Page 10&11)
- Round external retention free lids (Page 33&34)
- Round hatches (Page 35)
- Hatches with clamp (Page 36)