Manhole Inlet Skirt

Filter fabric skirt for preventing infiltration in manhole to pipe connections

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Custom Fitted Pipe Protection for Pipe Connections to Manhole Structures

MarMac Manhole Inlet Skirts are custom fitted pipe protection systems. Manhole Inlet Skirts are manufactured using specially engineered high-strength fabric designed to hold soil and fines in place and meets most DOT standards. They prevent leaching and undermining of subgrade material through openings that might occur at the connection of the pipe and the manhole wall.
MarMac Manhole Inlet Skirts are easily installed and permanent when backfilled. The skirts help to limit liability by minimizing the chances of failure. MarMac Manhole Inlet Skirts are cost effective and uniquely designed for quick and easy installation and the closure system allows for infinite adjustment. Manhole Inlet Skirts meet or exceed the material requirements of ASTM D 4632, ASTM D 4833, ASTM D 3786, ASTM D 4533, ASTM 4355, ASTM D 4751, ASTM D 4491.
  • Meets DOT standards
  • Reduces liability; reduces the need for costly repairs
  • Permanent protection
  • Closure system allows for infinite adjustment

Tell us about your application and let our experts help find the best solution for your situation—and send you a free quote!

Also ask about MacWrap for Manholes.



Test Method Minimum Avg. Roll Value (MARV) (English)

Minimum Avg. Roll Value (MARV) (Metric)

Grab Tensile

ASTM D 4632

160 lbs

712 N

Grab Elongation

ASTM D 4632



Puncture Strength

ASTM D 4833

85 lbs

378 N

Mullen Burst

ASTM D 3786

280 psi

1930 kPa

Trapezodial Tear

ASTM D 4533

60 lbs

267 N

UV Resistance

ASTM 4355



Apparent Size Opening (AOS)³

ASTM D 4751


0.212 mm


ASTM D 4491

1.30 sec¯¹

1.30 sec¯¹

Water Flow Rate

ASTM D 4491

110 gpm/ft²

4480 l/min/m²