Marathon offers a wide range of replacement styles and sizes of strainers and clamping rings. Available in Plastic, Aluminum and Cast Iron that range in sizes from 5" to 12" in diameter.


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Marathon 5 in. Adjustable Drain Guard
Cast Aluminum, No Tools Required
Price: $60.15
Availability: In Stock
Marathon Roofing Products Item #: 305-BS-1043 -

    SIZED TO FIT ALL DRAIN OPENINGS Lock out stones and debris with two quick twists of the wrist and prevent costly drain clogs for decades to come. Innovative guard adjusts to most residential and commercial roof drains, eliminating the expense and clutter of an extensive inventory of strainer sizes. Quickly installs to eliminate time and cost consuming fitting problems 5" (127mm) for small drains Sturdy cast aluminum dome and stainless steel hardware withstands extreme conditions INSTALLS...

    10 in. Cast Iron Strainer
    Economical, fits may applications. Friction fit, twist and lock
    Price: $78.70
    Availability: In Stock
    Marathon Roofing Products Item #: 305-C1-3080 -

      Economical, fits may applications. 10" is friction fit, twist and lock Sizes: 10" - 9-5/8"OD x 4-1/2"H

      Marathon 10 in. Adjustable Drain Guard
      Cast Aluminum, No Tools Required
      Price: $90.15
      Availability: In Stock
      Marathon Roofing Products Item #: 305-BS-1044 -

        SIZED TO FIT ALL DRAIN OPENINGS Lock out stones and debris with two quick twists of the wrist and prevent costly drain clogs for decades to come. Innovative guard adjusts to most residential and commercial roof drains, eliminating the expense and clutter of an extensive inventory of strainer sizes. Quickly installs to eliminate time and cost consuming fitting problems 10" (254mm) for normal drain openings  Sturdy cast aluminum dome and stainless steel hardware withstands extreme...

        10 in. Plastic Strainer, Bolt Down
        Economical, fits may applications
        Price: $25.75
        Availability: In Stock
        Marathon Roofing Products Item #: 305-C1-30752 -

          Economical, fits many applications 10" is bolt in place Black in color Sizes: 10" - 9-1/2"OD x 4-1/2"H

          12 in. Plastic Strainer
          Friction fit by twist and lock
          Price: $33.75
          Availability: In Stock
          Marathon Roofing Products Item #: 305-C1-3131 -

            Economical, fits many applications 12" is friction fit by twist and lock Black in color Sizes: 12" - 12-1/4"OD x 8-3/4"H

            Marathon C1-1852 - 5 in. Plastic Strainer
            Friction fit by twist and lock
            Price: $13.95
            Availability: In Stock
            Marathon Roofing Products Item #: 305-C1-1852 -

              Economical, fits many applications 5" is friction fit by twist and lock Black in color Sizes: 5" - 5-1/4"OD x 5-3/4"H

              Marathon BS-1300 Aluminum Retrofit Ring & Dome
              Resolve the difficult problem of matching old rings and domes
              Price: $210.75
              Availability: In Stock
              Marathon Roofing Products Item #: 305-BS-1300 -

                Made from High-Strength Aluminum Easily replace broken parts The retrofit ring and dome will match most old style existing drain bases, matching bolt patterns from 6” to 11-1/8” Designed for re-roofing applications when a clamping ring is important to secure single-ply and two ply membranes in waterproof roof systems By aligning the retrofit ring over the existing bolt holes in the old drain body and installing the new hold-down bolts with washers, the difficult problem of replacing matching...

                12 in. Cast Iron Strainer
                Economical, fits may applications. Friction fit, twist and lock
                Price: $89.35
                Availability: In Stock
                Marathon Roofing Products Item #: 305-C1-3132 -

                  Economical, fits may applications. 12" is friction fit, twist and lock Sizes: 12" - 12-1/4"OD x 7"H

                  8 in. Plastic Strainer
                  Friction fit by twist and lock
                  Price: $18.45
                  Availability: In Stock
                  Marathon Roofing Products Item #: 305-C1-1858 -

                    Economical, fits many applications 8" is friction fit by twist and lock Black in color Sizes: 8" - 7-5/8"OD x 5-1/2"H

                    12 in. Cast Aluminum Strainer
                    Economical, fits may applications. Friction fit, twist and lock
                    Price: $90.75
                    Availability: In Stock
                    Marathon Roofing Products Item #: 305-C1-3133 -

                      Economical, fits many applications. 12" is friction fit by twist and lock Sizes: 12" - 12-1/4"OD x 6"H

                      5 in. Cast Aluminum Strainer
                      Economical, fits may applications. Friction fit, twist and lock
                      Price: $36.55
                      Availability: In Stock
                      Marathon Roofing Products Item #: 305-C1-1870 -

                        Economical, fits many applications. 5" is friction fit by twist and lock Sizes: 5" - 5-1/4"OD x 5-3/4"H

                        Marathon 18 in. Adjustable Drain Guard
                        Cast Aluminum, No Tools Required
                        Price: $190.75
                        Availability: In Stock
                        Marathon Roofing Products Item #: 305-BS-1047 -

                          SIZED TO FIT ALL DRAIN OPENINGS Lock out stones and debris with two quick twists of the wrist and prevent costly drain clogs for decades to come. Innovative guard adjusts to most residential and commercial roof drains, eliminating the expense and clutter of an extensive inventory of strainer sizes. Quickly installs to eliminate time and cost consuming fitting problems 18" (457mm) for large drain openings  Sturdy cast aluminum dome and stainless steel hardware withstands extreme conditions...

                          Marathon BS-1300CI Cast Iron Retro Ring & Dome
                          Fits 3 or 4 bolt patterns from 6 1/2"-11 3/4"
                          Price: $214.75
                          Availability: In Stock
                          Marathon Roofing Products Item #: 305-BS-1300CI -

                            Made from Cast Iron Easy replacement for broken or missing roof drain domes and rings Maximum drainage Fits 3 or 4 bolt patterns ranging from 6 1/2" to 11 3/4" V channel scallop openings on the ring and dome

                            8 in. Cast Aluminum Strainer
                            Economical, fits may applications. Friction fit, twist and lock
                            Price: $39.05
                            Availability: In Stock
                            Marathon Roofing Products Item #: 305-C1-1890 -

                              Economical, fits many applications. 8" is friction fit by twist and lock Sizes: 8" - 7-5/8"OD x 6-1/4"H

                              Best Sellers

                              Marathon 5 in. Adjustable Drain Guard
                              Cast Aluminum, No Tools Required
                              Price: $60.15

                              SIZED TO FIT ALL DRAIN OPENINGS Lock out stones and debris with two quick twists of the wrist and prevent costly drain clogs for decades to come. Innovative guard adjusts to most residential and commercial roof drains, eliminating the expense and clutter of an extensive inventory of strainer sizes. Quickly installs to eliminate time and cost consuming fitting problems 5" (127mm) for small drains Sturdy cast aluminum dome and stainless steel hardware withstands extreme conditions INSTALLS...

                              10 in. Plastic Strainer, Bolt Down
                              Economical, fits may applications
                              Price: $25.75

                              Economical, fits many applications 10" is bolt in place Black in color Sizes: 10" - 9-1/2"OD x 4-1/2"H

                              12 in. Plastic Strainer
                              Friction fit by twist and lock
                              Price: $33.75

                              Economical, fits many applications 12" is friction fit by twist and lock Black in color Sizes: 12" - 12-1/4"OD x 8-3/4"H

                              Marathon 10 in. Adjustable Drain Guard
                              Cast Aluminum, No Tools Required
                              Price: $90.15

                              SIZED TO FIT ALL DRAIN OPENINGS Lock out stones and debris with two quick twists of the wrist and prevent costly drain clogs for decades to come. Innovative guard adjusts to most residential and commercial roof drains, eliminating the expense and clutter of an extensive inventory of strainer sizes. Quickly installs to eliminate time and cost consuming fitting problems 10" (254mm) for normal drain openings  Sturdy cast aluminum dome and stainless steel hardware withstands extreme...

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