Manholes

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Kerkstra Precast provides storm manholes, catch basins, and sanitary manholes. Manholes can be produced in 24” – 120” diameter. All manhole structures are produced to ASTM C-478 specifications and all watertight manholes are produced to ASTC C-448 specifications.

We also provide exterior drop connections on our sanitary manholes when called for.

Technical Info

• Manholes - Part 1
• Manholes - Part 2
• 7101 Maximum Pipe Sizes Per Manhole Dia.
• 7102 Typical Manhole Base Slab Detail
• 7111 36”, 48”, & 60” Dia. Manhole Flat Tops
• 7112 48” & 60” Dia. Manhole Flat Tops
• 7113 72”, 84”, & 96” Dia. Manhole Flat Tops – 1
• 7114 72”, 84”, & 96” Dia. Manhole Flat Tops – 2
• 7115 120” Dia. & No Lip Manhole Flat Tops
• 7151 Typical Manhole Joint Details – 1
• 7152 Typical Manhole Joint Details – 2
• 7171 Manhole Flow Channels – Typical Examples
• 7172 Full Height Manhole Flow Channels – Typical Examples
• 7201 Manhole Height Figures for 24" Dia. Structures
• 7202 24” Dia. Manhole w/ 3” Wall
• 7203 24” Dia. Manhole w/ 6” Wall
• 7204 24” Dia. Leeching Manhole w/ 3” Wall
• 7205 36” Dia. Manhole w/ Flat Top
• 7231 Manhole Height Figures for 48” Dia. Structures
• 7232 48” Dia. Sanitary Manhole
• 7233 48” Dia. Sanitary Manhole w/ Full Height Flow Channel
• 7234 48” Dia. Sanitary Manhole w/ Flow Channel & Internal Base
• 7235 48” Dia. Sanitary Manhole w/ Full Height Flow Channel & Internal Base
• 7236 48” Dia. Sanitary Manhole w/ Flow Channel & Flat Top
• 7237 48” Dia. Sanitary Manhole w/ Full Height Flow Channel & Flat Top
• 7238 48” Dia. Sanitary Manhole w/ Flow Channel, Internal Base, & Flat Top
• 7239 48” Dia. Sanitary Manhole w/ Full Height Flow Channel, Internal Base, & Flat Top
• 7240 48” Dia. Sanitary Manhole w/ Precast Drop
• 7241 48” Dia. Sanitary Manhole w/ Precast Drop & Internal Base
• 7242 48” Dia. Storm Manhole
• 7243 48” Dia. Storm Manhole w/ Internal Base
• 7247 48” Dia. Doghouse Manhole w/ Cone
• 7248 48” Dia. Leeching Manhole
• 7261 Manhole Height Figures for 60" Dia. Structures
• 7262 Manhole Height Figures for Large Dia. Structures w/ Reducer
• 7263 60”, 72”, 84”, 96”, & 120” Dia. Sanitary Manholes w/ Flat Top
• 7264 60”, 72”, 84”, 96”, & 120” Dia. Sanitary Manholes w/ Internal Base & Flat Top
• 7265 60”, 72”, 84”, 96”, & 120” Dia. Storm Manholes w/ Flat Top
• 7266 60”, 72”, 84”, 96”, & 120” Dia. Manholes w/ Reducer
• 7267 60”, 72”, 84”, 96”, & 120” Dia. Manholes w/ Jointed Loose Base & Reducer
• 7268 60” & 72” Dia. Manholes w/ Reducer Cone & Cone Top
• 7269 60”, 72”, 84”, 96”, & 120” Dia. Doghouse Manholes w/ Flat Top
• 7270 60”, 72”, 84”, 96”, & 120” Dia. Leeching Manholes w/ Flat Top
• 7290 Miscellaneous Manhole Products
• 7301 MDOT Manhole Base Type 2 – 48”-60” Dia. Sewer
• 7302 MDOT Manhole Base Type 2 – 66”-78” Dia. Sewer