900 mm ID
#0311 – 900 ID (36″) 0.3vm Manhole Riser
#0312 – 900 ID (36″) 0.61vm Manhole Riser
#0313 – 900 ID (36″) 0.91vm Manhole Riser
#0313-IB – 900 ID (36″) x 0.91vm Manhole – IB c/w Inside Base
#0316 – 900 ID (36″) Manhole Lid – 635 mm Op
#0317 – 900 ID (36″) Manhole Lid – 762 mm Op
#0318-B37 – 900 ID (36″) Manhole Lid – B37 Op