What is the function of the BILKA hopper in the drainage system?

The BILKA hopper is the transition piece that collects water through the opening in the gutter and directs it to the downpipe line. The shape in Shopify corresponds to the system's running outlet, and the options are grouped as 125/90 and 150/100. The element is attached to the gutter after the downpipe location is measured and the opening is cut. It does not replace the downpipe itself, the elbows, or the wall brackets under the eaves.

Which BILKA hopper is chosen for a 125 mm gutter and which for a 150 mm gutter?

For a 125 mm gutter, the 125/90 hopper is chosen, which transitions to 90 mm pipe elements. For a 150 mm gutter, the correct group is 150/100 and continues with a 100 mm pipe. The two groups are not interchangeable. The size is determined before cutting the gutter because the diameter of the opening and the attachment shape must match the chosen downpipe and the factory element.

What variants and SKUs does the BILKA hopper have in Shopify?

The hopper has 36 Shopify variants: 18 each for the 125/90 and 150/100 systems, with matte, glossy, or "Zinc" finishes. For example, 125/90 / Matte / RAL 8017 is SKU LT-1515, and 150/100 / Zinc is LT-1549. Each order must include the full size group, coating, and color. Simply stating "brown hopper" is not enough because similar RAL shades and both cross-sections have different codes.

How is the gutter prepared for installing the BILKA hopper?

The downpipe location is marked on the unsecured gutter according to the 90 or 100 mm size. BILKA prescribes that the opening be cut with a hacksaw or hand shears, without a circular saw or angle grinder. The cut edges are bent outward to direct water toward the collector, after which the hopper is clamped to the profile using its factory elements. Shavings are cleaned before final assembly to avoid damaging the coating.

Where on the gutter is it correct to place the BILKA hopper?

The position is determined by the downpipe column design, gutter slope, and the free vertical path along the facade. The catalog recommends at least one downpipe every 8 linear meters of gutter as a general guideline, but architecture and water flow may require more. The hopper is placed at the lowest point of the respective section, avoiding unsuitable supports, windows, or places where the pipe cannot be secured.

What is the difference between the BILKA hopper and the separate BILKA funnel?

The hopper is mounted directly under the cut opening in the gutter and makes the 125/90 or 150/100 transition to the downpipe line. The separate funnel is an independent collector with a 90 or 100 mm pipe outlet and a different inlet shape. The two products have separate SKUs and should not be swapped just because both direct water to a pipe. The choice depends on the specific inlet, gutter profile, and project detail.