reference will now be made in detail to embodiments of the invention , one or more examples of which are illustrated in the drawings . each example is provided by way of explanation of the invention , and not meant as a limitation of the invention . for example , features illustrated or described as part of one embodiment can be used with another embodiment to yield still a third embodiment . it is intended that the present invention include these and other modifications and variations . an exemplary embodiment of a connection assembly 10 is shown in fig2 . the connection assembly 10 includes a first connection member 12 that is engaged with a second connection member 14 . the connection assembly 10 is designed to include both a positive locking engagement between the first and second connection members 12 and 14 along with a way of disengaging the locking arrangement by rotating the first and second connection members ; 12 and 14 relative to one another . such an arrangement is advantageous because the connection assembly 10 will only be disengaged when desired by a user , and not disengaged by accident . additionally , relative rotation between the first and second connection members 12 and 14 provides for a way of disengaging the connection assembly 10 without requiring a user to exert substantial force . the first connection member 12 is shown in fig2 as being a rotatable manifold 34 . the rotatable manifold 34 may be incorporated into a respiratory circuit in order to permit access to the respiratory circuit through various ports . the rotatable manifold 34 shown in fig2 has two ports 36 and 38 located thereon . in other exemplary embodiments of the present invention , the rotatable manifold 34 may be supplied as the first connection member 12 with a varying number of ports located thereon . additionally , other exemplary embodiments of the present invention include a first connection member 12 that has only one port located thereon . a rotatable manifold 34 is known from u . s . pat . no . 5 , 735 , 271 which is assigned to the assignee of the current application and is incorporated herein for all purposes in its entirety . the rotatable manifold 34 allows for the access of the respiratory circuit by a medical caregiver through different ports which may be sized and configured to accept various medical instruments and fluids . other exemplary embodiments exist where the connection assembly 10 is not incorporated with a rotatable manifold 34 , but incorporated with other components of the respiratory circuit . shown engaged with the first connection member 12 in fig2 is the second connection member 14 . the connection between the first and second connection members 12 and 14 is effected by a groove 32 and locking member 16 . the locking member 16 is located on one end of port 38 of the first connection member 12 . the locking member 16 is simply a projection that extends substantially around the circumference of the port 38 . groove 32 is located substantially around the circumference of a section of the second connection member 14 . the groove 32 and the locking member 16 are sized in such a way that engagement between the two causes a “ snap - fit ” connection . this connection prevents the first and second connection members 12 and 14 from separating from one another during normal use of the respiratory circuit . therefore , the connection assembly 10 will not become disengaged during normal use , and will only become disengaged when desired by a medical caregiver . [ 0029 ] fig1 is a bottom plan view of a first connection member 12 being a rotatable manifold 34 with two ports 36 and 38 located thereon . a first opening of the connection member 22 and a second opening of the first connection member 23 are located through ports 36 and 38 . these openings 22 and 23 allow for the transport of fluids and medical devices into and out of the respiratory circuit . it is to be understood that in the present application , the word “ port ” is defined to be a member that has an opening therethrough . both the opening and the member can be of any shape . the member is configured to allow for the passage of fluids and / or medical devices to and from the respiratory circuit . [ 0030 ] fig3 shows an exemplary embodiment of a second connection member in accordance with the present invention . here , a barb 40 is located on one end of the second connection member 14 . the barb 40 is designed to engage a barb locking surface 42 of the first connection member 12 as shown in fig4 . in this exemplary embodiment , insertion of the second connection member 14 into the opening of the first connection member 22 causes the barb 40 to be compressed . once the barb 40 clears the length of the first opening of the first connection member 22 , the barb 40 snaps into place onto the barb locking surface 42 . this in effect causes a positive locking connection between the first and second connection members 12 and 14 . this arrangement can be thought of as a “ snap - fit ” connection . the use of a barb 40 to effect the locking of the connection assembly 10 may be substituted for or used in addition to the use of a locking member 16 in combination with a groove 32 to effect the locking of the connection assembly 10 . as such , exemplary embodiments of the present invention may include exemplary embodiments that include only a barb 40 , a locking member 16 , or both locking member 16 and barb 40 . additionally , other exemplary embodiments of the present invention may include members that form a positive locking arrangement between the first and second connection members 12 and 14 that are known in the art . in order to disengage the first connection member 12 from the second connection member 14 , a disconnect member 26 is provided . the exemplary embodiments shown in fig2 and 3 show a disconnect member 26 that is a irrigation port 30 having a cylindrical surface 28 . in other exemplary embodiments of the present invention , only a semi - cylindrical surface 28 is present . additionally , other exemplary embodiments of the present invention include a disconnect member 26 that has only a partially curved surface . also , the disconnect member 26 does not have to be an irrigation port 30 , but may simply be a lug or other member . an advantage of using the irrigation port 30 as the disconnect member 26 is that the irrigation port 30 may be used for another function such as the introduction of lavage into the respiratory circuit . [ 0032 ] fig5 shows an exemplary embodiment of the first connection member 12 in accordance with the present invention . more particularly , fig5 shows a recess 18 being located on one end of a port 38 of the rotatable manifold 34 . recess 18 is curved in order to receive the cylindrical surface 28 of the second connection member 14 of fig3 . additionally , recess 18 in fig5 defines a ramp 20 . in the exemplary embodiment shown in fig5 ramp 20 extends to the end of the port 38 . the locking member 16 is a locking ring that substantially surrounds port 38 , but does not completely surround port 38 . the locking member 16 is interrupted in the vicinity of the recess 18 . during engagement between the first and second connection members 12 and 14 , the disconnect member 26 is inserted into the recess 18 , and seats against the port 38 . recess 18 is sized and shaped in order to accept the cylindrical surface 38 of the irrigation port 30 . groove 32 is fit around the locking member 16 and the combination of the two securely holds ; the first and second connection members 12 and 14 against one another . to disengage the connection assembly 10 , a user will rotate the first and second connection members 12 and 14 with respect to one another such that the disconnect member 26 is pushed against the ramp 20 . the cylindrical surface 28 of the irrigation port 30 is then urged against ramp 20 and moves against ramp 20 . this movement results in a force that has a component in the direction of arrow a in fig5 . this force then causes the locking member 16 to be disengaged from the groove 32 and allows the first connection member 12 to be removed from the second connection member 14 . as such , the exemplary embodiment shown in fig5 has a first connection member 12 that is disengaged from the second connection member 14 upon clockwise rotation of the second connection member 14 with respect to the first connection member 12 . however , other exemplary embodiments of the present invention exist where the ramp 20 is positioned opposite to the position shown in fig5 such that the first connection member 12 is disengaged via counterclockwise rotation of the second connection member 14 . in addition , other exemplary embodiments exist where the recess 18 defines two ramps 20 on the port 38 of the rotatable manifold 34 . here , a user can disengage the first and second connection members 12 and 14 by rotating them relative to one another in either direction . [ 0035 ] fig6 shows another exemplary embodiment of the present invention where a first connection member 12 has two ports 36 and 38 both having a locking member 16 and a recess 18 defined on one end . as such , the connection assembly 10 may be included in all of the ports of the rotatable manifold 34 and not only on a single port of the rotatable manifold 34 . additionally , the fit between the first and second connection members 12 and 14 may be tight enough in other exemplary embodiments of the present invention such that a seal is formed between the first and second connection members 12 and 14 . a taper may be provided on one of the connection members 12 and 14 to effect this seal in other exemplary embodiments . it should be understood that the invention includes various modifications that can be made to the exemplary embodiments of the medical connector for a respiratory circuit as described herein as come within the scope of the appended claims and their equivalents .