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: $62.00
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...

Marathon #C1-3080 10 in. Cast Iron Strainer
Economical, fits may applications. Friction fit, twist and lock
Price: $82.70
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

10 in. Plastic Strainer, Bolt Down
Economical, fits may applications
Price: $26.75
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

Marathon 10 in. Adjustable Drain Guard
Cast Aluminum, No Tools Required
Price: $93.35
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...

12 in. Plastic Strainer
Friction fit by twist and lock
Price: $36.40
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: $16.00
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...

Marathon #C1-3132 12 in. Cast Iron Strainer
Economical, fits may applications. Friction fit, twist and lock
Price: $98.70
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: $19.05
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: $94.70
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: $38.65
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: $198.70
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: $41.75
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: $62.00

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: $26.75

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: $36.40

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: $93.35

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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