Holder (1) provided with a sealing member (2, 200) through which holder a first and second crutch can be coupled together at an angle to each other, which holder comprises a first fastening portion (10 10 ) and a second fastening portion 10, 10 ), wherein each of the aforementioned fixtures (10 , 10 ) consists of an elongate cross section (11) curved in cross direction, which bottom slit (11) has a certain radius of curvature (R) slots (12, 12) coupled to the bottom groove on both sides of the bottom groove width, and the groove walls (12, 12) of the first retaining part (10 10 ) and the second fastening part (10 10 ) can be adjusted to one another at their edges, wherein a first movable fastening channel (1000) is formed within them, in which fastening channel the body of the first crutch (8) can be placed, two fastening means (20 20 , 2020 ) protrude from the frame of the fastening portions (10 10 , 10 10 ), which fastening means (20 20, 20 20 ) together form a second fastening channel (2000) in which the second crush frame (8) can be placed, characterized in that in both of the longitudinal ends of the first fastening part (10 10 ) and the second fastening part (10 10 ) which form the tubular fastening channel (1000) of the holder (1) there is a transverse sealing slots (14, 14 , 14 14 ) in the fastening part, which sealing groove extends substantially between the edges of the fastening part (10 10, 10 10 ) and in each of which sealing slots (14, 14) can be installed sealing member (2, 200) in a fixed manner, which sealing member is substantially equal to said sealing groove (14, 14 , 14 14 ) and which sealing member (2, 200) is formed by the groove (3, 300) in the sealing groove (14,14) longitudinal direction, on both sides of which the groove bottom is coupled to slots (4) whose height from said groove bottom (3, 300) varies.Tiivisteosalla (2, 200) varustettu pidike (1), jonka välityksellä ensimmäinen ja toinen kyynärsauva ovat kytkettävissä kulmaan toisiinsa n
