the present invention provides a system and method that solves the problem of shock waves and water hammer which develop in a fluid system , including both a liquid and gas system . in particular , the present invention provides an absorber system , particularly a pressure absorber and / or water volume absorber , that can be installed in the piping of a fluid system such that a sudden change or stop in fluid flow through the piping , which results in a fluid and pressure wave propagating in the pipe , causes in the fluid and pressure wave to enter the pressure absorber which controls and absorbs the fluid and pressure wave . the absorber system is capable of absorbing pressure shock waves and fluid waves and preventing water hammer . referring now to fig2 - 3 , an exemplary absorber system 10 is shown , wherein the absorber system 10 includes a membrane 12 having a generally spherical shape . the absorber system 10 is generally configured to be insertable within a fluid system , such as extending from a wall of a pipe in fluid communication with the contents of the pipe . generally , fluid is present in the fluid system and in communication with the absorber system 10 during normal operation of the fluid system and in the presence of a pressure shock wave and / or fluid shock wave . as shown in the embodiment in fig3 a - 3b , the absorber system 10 includes a housing 14 and a joint 20 extending from a bottom of the housing 14 . the joint 20 is configured for insertion through a pipe in a fluid system and is hollow so as to allow the flow of fluid from the fluid system into the joint 20 . the housing 14 is also hollow and is in fluid communication with the joint 20 such that fluid from the fluid system entering the joint 20 flows into the housing 20 . the housing 14 and joint 20 can be any shape and are not particularly limited in size . according to an exemplary embodiment , the housing 14 is similar in shape to the membrane 12 housed therein . further , the joint 14 can be narrower in size than the pipe of the fluid system in which it is inserted such that fluid flowing through the pipe will flow through the pipe generally rather than be diverted into the joint 20 unless a pressure shock and / or water shock wave is created which forces fluid from the pipe into the joint 20 . of course , the joint 20 can be provided such that fluid is always present in the joint and the housing 14 regardless of whether a pressure shock or fluid shock wave is present , and wherein a pressure shock and or fluid shock wave further forces fluid from the pipe into the joint for absorption by the absorber system 10 . according to preferred embodiments , the joint 20 is formed such that it can be placed on an existing pipe , conduit , pipeline or the like within a fluid system , even while there is fluid under pressure in the pipe , etc . it is not necessary to cut the pipe and install a tee - joint therein in order to insert the absorber system 10 . further , the piping does not have to be spliced or changed , and does not have to be drained in order to install the absorber system 10 . there is further no need to use a professional plumber to install the absorber system 10 . the absorber system 10 can simply be installed in a top side of the pipe and extending upwards . the absorber system 10 can be inserted in many types of pipe , including thin - walled and lightweight copper tubing ( as used for water lines ) as well as plastic pipes . because the membrane 12 of the invention is completely self - contained ( i . e ., is formed so as to be flexible and compressible to absorb pressure and / or a fluid volume on its own ), the absorber system 10 is fully functional once it is inserted in a pipe with the joint 20 extending into the pipe in fluid communication with the contents thereof . as shown in fig2 - 3 , the membrane 12 is depicted as being spherical in shape . however , any other shapes of membranes 12 can suitably be used as long as the membrane 12 is hollow and / or contains one or more air pockets to allow the membrane 12 to flex and compress when exposed to a pressure shock or water volume increase , thereby controlling and absorbing the pressure shock and preventing water hammer . according to one embodiment of the present invention ( e . g ., as shown in the embodiment in fig4 a and 5 ), by providing a hollow membrane that is both rigid and flexible , the membrane itself can absorb pressure and / or a water volume increase . this is in contrast to the conventional use a diaphragm provided with an air precharge , because in such diaphragm systems , it is the air precharge that provides the absorption of pressure and / or water volume increase by compressing the air in a fixed volume . according to another embodiment of the present invention ( e . g ., as shown in the embodiment in fig4 b and 5 ), a hollow membrane 12 is provided that contains , within the membrane itself , a precharged air cushion to absorb a pressure shock . in such an embodiment , the precharged air cushion primarily provides the membrane 12 with the resistance to the pressure shock and / or water volume increase . as shown in fig4 b and 5 , this embodiment containing the air precharge generally has a thinner and more flexible membrane compared with the embodiment that does not contain an air precharge . as shown in fig3 a - 3b , the housing 14 can be of a shape similar to that of the membrane 12 housed thereon . of course , the housing 14 shape is not limited to shapes corresponding to that of the membrane contained therein provided that it can adequately house the membrane 12 and allow the membrane 12 to come into contact with fluid forced inside of the housing 14 as the result of a pressure shock and / or water volume increase and flex and compress as a result of such contact . preferably , the housing 14 is sized and shaped such that there is not excessive space surrounding the membrane 12 which could result in the water forced into the housing 14 as the result of a pressure shock to come into contact with the outer walls of the housing 14 rather than , or in addition to , coming into contact with the membrane 12 . this would be undesirable because the membrane 12 is fabricated so as to flex and compress to absorb and control the pressure shock . on the other hand , the housing 14 is generally a more rigid structure which does not flex and compress and , thus , this could result in inadequate absorption and control of the pressure shock . as such , it is preferable that the inner structure of the housing 14 and the outer surface of the membrane 12 are complimentary to encourage fluid forced into the pressure absorber to come into contact with the membrane 12 so that the pressure shock can be adequately absorbed and controlled . according to some embodiments , the membrane 12 is configured such that is both hollow and contains one or more air pockets . in particular , the membrane can be provided such that one or more portions of the membrane 12 are hollow ( e . g . a right half or other fraction or the membrane ) while a remainder of the membrane 12 contains one or more air pockets . for example , the membrane 12 can have an overall spherical shape , with a right half being hollow in shape and a left half being solid or substantially solid and containing on or more air pockets therein . the hollowness of the membrane 12 or the one or more air pockets are configured such that the membrane flexes and compresses to absorb pressure . according to another embodiment , the entire membrane 12 can be hollow and the one or more air pockets can be formed within a thickness of the walls forming the membrane 12 . as described , the membrane 12 is designed so as to be flexible and to be compressible such that pressure applied thereto results in the membrane flexing and compressing to absorb the pressure and / or water volume increase . as such , the materials which can suitably be used in forming the membrane 12 include those which are flexible . some suitable materials include poron ®, rubber , butyl , ethylene propylene diene monomers ( epdm ), neoprene , silicone , plastisol ( flexible pvc ), and the like . in addition , the membrane 12 can be designed such that when it is hollow , it has a wall thickness that also can contribute to providing the desired flexibility . in the case of membranes 12 which are more solid in form and contain one or more air pockets , the air pockets are typically provided at an outer portion of the membrane 12 to provide compression into the air pocket when pressure is applied to the membrane 12 . as such , the thickness of material forming the membrane 12 above the air pocket can contribute to providing the desired compressibility . according to an exemplary embodiment , the membrane 12 is a spherically shaped hollow structure formed of poron ®. the structure is one which flexes to absorb pressure but which generally maintains its overall spherical shape under pressure . such a structure is one in which the membrane has some flexibility , but is rigid enough not to deform . according to another exemplary embodiment , the membrane 12 is cylindrical in shape and is positioned with the flat drum portions extending along the direction of the pipe flow . as such , as water is forced into the pressure absorber 10 , it comes into contact with the flat drum portion which flexes and absorbs the pressure . while the flat drum portion flexes to absorb pressure , the cylindrical membrane 12 as a whole generally maintains its cylindrical shape . according to another exemplary embodiment , the membrane 12 is egg shaped and is positioned within the absorber system 10 such that it is impacted by water so as to flex across its major axis rather than its minor diameter . in any of the above or other embodiments , the material and / or thickness of the membrane can be designed such that random flex provides performance . in particular , the membrane can be provided such that it is made of a variety of materials in different locations and / or can be provided with a plurality of different wall thicknesses so as to provide varying degrees of flex upon being subjected to a pressure shock . as such , the membrane is capable of flexing depending upon the size of the shock wave and / or the location of the membrane that is subjected to the shock wave . the present absorber system 10 and membrane 12 design is advantageous because the membrane 12 is one piece in design , and is a stand - alone component which is formed of a material and thickness such that when it comes into contact with a water volume increase and / or pressure shock , it absorbs and controls the volume increase and / or pressure shock in a system . this membrane 12 is a separate part from the absorber system 10 that is contained within the housing 14 and , thus , can be removed and replaced as desired while maintaining the rest of the pressure absorber components . in certain embodiments , there is no requirement for a means for air precharge and , thus , no parts for air precharge are required . still further , the design of the membrane and the absorber system 10 is such that there is no potential for loss of air precharge and , therefore , loss of function over time . in addition , embodiments of the present absorber system 10 are maintenance - free , so there is no need for inspection and maintenance of air precharge . while particular embodiments of the present invention have been shown and described , it will be obvious to those skilled in the relevant arts that changes and modifications may be made without departing from the invention in its broader aspects . therefore , the aim in the appended claims is to cover all such changes and modifications that fall within the true spirit and scope of the invention . the matter set forth in the foregoing description and accompanying drawings is offered by way of illustration only and not as a limitation . the actual scope of the invention is intended to be defined in the following claims when viewed in their proper perspective based on the prior art .