Patent ID: 8225809

Claim:
A method for introducing a fluid system cleaning device into a pipe, comprising: providing a coupling for use in a fluid system, said coupling comprising: a sleeve coupled to a pipe, said sleeve having a groove therein, and said sleeve having a recess formed in said groove; an end cap having a collar handle and at least one engagement member, said engagement member facilitating selective engagement of said end cap with said sleeve; and a locking mechanism that selectively engages said sleeve to selectively and substantially prevent axial rotation of said end cap relative to said sleeve in both a first direction and a second direction, wherein said locking mechanism comprises a pin adapted to extend through an aperture in said end cap and into said recess in said sleeve; disengaging said locking mechanism from said sleeve; rotating said end cap axially relative to said sleeve, and in the first direction, thereby fully disengaging said engagement member from said groove of said sleeve, wherein said engagement member fully disengages from said groove only when said pipe has a line pressure below a predetermined level, and wherein when said pipe has a line pressure at or above said predetermined level, said engagement member is substantially prevented from fully disengaging from said groove; inserting a fluid system cleaning device through said sleeve and into said pipe; coupling said end cap to said sleeve by positioning said engagement member within said groove of said sleeve and rotating said end cap axially relative to said sleeve, and in the second direction, wherein said second direction is the opposite of said first direction; and engaging said locking mechanism with said sleeve to substantially prevent axial rotation of said end cap relative to said sleeve in both the first direction and the second direction.