Plastic pump housing consisting of an inner casing, an outer casing and filling material therebetween

A pump housing, comprising:

• a first casing;
• a second casing;
• and
• a space filling material,
• wherein
• the first and second casings are made of plastic,
• the first and second casings are configured such that when positioned adjacent to one another a space exists between the first and second casings,
• the space-filling material is located in the space between the first and second casings,
• at least one part of the pump housing is formed from a plurality of segments, each of the plurality of segments being formed from a pair of the first and second casings the plurality of segments have no undercuts,
• the plurality of segments are configured to be connected to one another by connection flanges,
• the plurality of segments includes at least two geometrically identical segments.