Abstract: A percolation block element having a base wall and hollow columns. With two identical percolation block elements that are aligned in the same direction, a stack of the two identical percolation block elements can be formed. The percolation block element has an axial symmetry of 180° or less. With two identical percolation block elements arranged rotated by 90° relative to one another about a rotational axis, the column tips of the first percolation block element can be introduced into the column tip receptacles of the second percolation block element, and an operating distance can be formed between a first base wall and a second base wall.

Abstract: The invention relates to a percolation block element (1, 26, 41, 45) having a base wall (2, 31, 42, 46) to which hollow columns (3, 28, 36, 37, 38, 39, 43, 47, 50, 51, 52) are connected. With two identical percolation block elements that are aligned in the same direction, the first columns of the first percolation block element can be introduced into the second columns of the second percolation block element, and a stack of the two identical percolation block elements that are aligned in the same direction can be formed. The percolation block element has an axial symmetry of 180° or less when rotated about an axis of rotational symmetry (A1, A2, A4, A5).

Abstract: Device (V) for catching rainwater from a downpipe (F) comprising an opening (11), a branch pipe (5) with a sickle-shaped water-catching blade (12) comprising two halves at the end, a support member (1) traversed by the branch pipe (5) and a retainer. The branch pipe (5) engaging into the opening (11) with the water-catching blade (12) placed in the downpipe, and wherein the downpipe (F) can be fixed in the area of the support member (1) covering the opening (11) by means of the retainer (H). The retainer (H) comprises at least one undercut engagement hook (17) that can be passed through the opening (11), and an engagement hook tensioning system (S) interconnected between the support member (1) and the engagement hook (17).

Abstract: In a device (V) for catching rainwater from a downpipe (F) comprising an opening (11), wherein the device (V) comprises a branch pipe (5) with a water-catching blade (12) at the end, a support member (1) traversed by the branch pipe (5) and a retaining means, and comprising a branch pipe (5) engaging into the opening (11), a catching blade (12) placed in the downpipe, and wherein the downpipe (F) can be fixed in the area of the support member (1) covering the opening (11) by means of the retaining means (H) at the downpipe (F), the retaining means (H) comprises at least one undercut engagement hook (17) that can be passed through the opening (11), and an engagement hook tensioning system (S) is functionally interconnected between the support member (1) and the engagement hook (17).

Abstract: A water tank T of plastic material which is joined by using at least two open and identical tank parts 1 and a joining plane 2, the tank parts having respective opening structures R with a flattened inner opening edge, a sealing channel 26 being open towards the joining plane, and an outer flattened opening edge, the inner and outer opening edges within the opening edge structure are situated in each tank part 1, 35 in the joining plane 2, the opening edge at the same time defining inner and outer fitting surfaces 16, 17, respectively with a width exceeding the thickness X of the tank part wall 30 and the sealing channel wall 34 by at least about the half, such that the water tank T selectively can be manufactured from the same tank parts 1, 35 either monolithically by welding the fitting surfaces 16, 17 without sealing means in-between to each other or separable by clamping the opening edge structures R from the outer side with sealing means 33 provided between both tank parts 1, 35.

Abstract: In a tank B for water treatment, consisting of at least two plastic material tank parts 1, 2 produced by injection moulding or by injection moulding and embossing a separately produced separation wall T is mounted with the edge at the walls of the tank parts such that the mounting regions at least partly are watertight. The separation wall T extends in the tank B crosswise to the joining plane E. The tank parts have opening edge structures R which fit on each other and which are joined in the joining plane E in watertight fashion.