Manholes - Formcrete Fiberglass Products

Manholes - Round holes for Mortar Joints in Standard Premium

For holes not intended for installation of field installed rubber connectors.
Both through holes and partial indentation knock out formers available.
Partial Hole/Knockouts must be ordered with attachment so they can be held tight to jacket wall.
Hole form diameters do not represent specific inside pipe diameter applications.
Hole diameters shown below are measured at the face of the Hole Form or at the inside radius of the manhole.
Super Durable 5/16” overall fiberglass laminate thickness.
Smooth surface concrete resistant polyester white gel coat for easier extraction.
We can create a custom sized mold that is not currently listed in this table.

Responsive Table

Manhole ID WALL	48" 5'	Wall Taper	60" 6'	Wall Taper	72" 7'	Wall Taper	84" 8'	Wall Taper	96" 9'	Wall Taper
4"	4485	5.4
5"	7485	10.6
7"	10485	7.1	16006	7.1	10727	9.6
10"	12485	10.6	16006	10.3	12727	10.9	12969	10.4
12"	14485	10.6	16006	10.9	14727	10.6			15969	9.8
15"	16485	8.5	16006	10.0	16727	10.1
18"	18485	11.3	16006	10.0	18727	10.1
21"	21485	9.9			22727	10.6
24"	24485	9.2	24608	7.8	24727	8.9	24848	10.8
27"	27485	16.4	27608		27727	18.1
30"	30485	16.4	30608	16.0	30727	19.0
36"	36485	17.4	40608	20.6	36727	18.5	36728
42"	42485	21.8	42608	21.1	42727	17.4
48"	48485	21.1	48608	21.1	48727	19.9
52"	52606	19.2	52727	19.0	52848
58"	58606	18.4					58848	9.5
62"	62606
76"							72848	10.0

Revised: 10/12/22