How it connects
The user pinches or rolls the flexible expanded mesh cylinder to reduce its diameter, pushes it into the gutter outlet opening, and releases it so it springs outward against the inside walls to seat via spring tension and friction.
Male and female halves
Male insertion element (the compressible bottom skirt of the strainer) mating into a female downspout outlet opening / drop tube.
Usually connects to
- round gutter drop outlet
- rectangular or corrugated gutter downspout drop outlet
- downspout opening
Common sizes
- Nominally sized to fit 2-inch to 4-inch (typically 2x3 in, 3x4 in, or 3-inch round) gutter downspout outlets.
Where it is used
residential gutter systemsroof drainagerainwater harvesting
Variations
- expanded aluminum mesh
- flexible galvanized steel wire mesh
- plastic / wire balloon strainer
How to recognise it
Recognized by an open cylindrical tube or bottom section formed from diamond-pattern expanded aluminum or wire mesh that is pliable enough to compress by hand into a downspout opening.
Often confused with
| Confused with | How to tell them apart |
|---|---|
| Rigid drop outlet sleeve | Rigid sleeves are solid flanged metal or vinyl tubes fastened or pop-riveted into the gutter, not compressible mesh. |
| Snap-in gutter guard | Snap-in guards clip horizontally across the top edges of the entire gutter trough rather than inserting vertically into the downspout drop outlet. |
Also called
expandable downspout strainer basepush-in gutter strainer sleevewire mesh gutter filter skirt
Good to know
This describes the mating/mounting interface of universal mesh leaf strainers. It relies on elastic deformation and outward spring friction against unthreaded drop outlet walls without fasteners or seals.
Design with real parts
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