Abstract: The invention relates to a connection between two pipe parts. One of the pipe parts (1, 2) comprises a male end (3) and the other pipe part (1, 2) comprises a female end (4). The two pipe parts (1, 2) can be connected together by positioning the male end (3) to the female end (4) such that the pipe parts (1, 2) are rotated with respect to each other when they are connected. At least one end (3, 4) of one pipe part (1, 2) is provided with at least one protrusion (11) and at least one end (3, 4) of the other pipe part (1, 2) is provided with a corresponding recess such that the protrusion (11) and the recess together lock the pipe part (1, 2) to a correct positioned with respect to each other. The protrusion (11) is positioned on the outer circumference of the pipe part (1, 2), whereby the protrusion (11) is manipulatable outside of the pipe part (1, 2).

Abstract: A pipe coupling for connection to a pipe end of pipe made of polymer material includes an inner sleeve which is intended for insertion into the pipe end and for abutment with the inner surface of the pipe end, and an outer sleeve which is intended for abutment with the outer surface of the pipe end and which includes a slot-like opening. The pipe coupling also includes a device for adjusting the opening, and a pre-widening device positioned between the edges of the slot-like opening. The pre-widening device makes the slot-like opening larger such that the inner diameter of the outer sleeve is larger than the outer diameter of the pipe.

Abstract: A manifold (1) comprises a body (2) with a plurality of branch fittings (3) diverging therefrom. The inner surface of the body (2) is conical such that the inner cross-sectional area of the body (2) decreases in the direction of flow. The manifold (1) is particularly well suited for use in tap water systems. The manifold (1) can be manufactured e.g. from polyphenyl sulfone PPSU, polysulphone PSU, polyvinylidene fluoride PVDF, glass fiber reinforced polyamide PA, or cross-linked polyolefin plastic.

Abstract: The pipe coupling for connection to a pipe end of a pipe made of polymer material comprises an inner sleeve (1) which is intended for insertion into the pipe end and for abutment with the inner surface of said pipe end, an outer sleeve which is intended for abutment with the outer surface of said pipe end and which includes a slot-like opening (14), and means for adjusting said opening (14). The coupling further comprises a pre-widening means positioned between the edges (21) of the slot-like opening (14). The pre-widening means makes the slot-like opening (14) larger such that the inner diameter of the outer sleeve (2) is larger than the outer diameter of the pipe.