Fluid line connecting system

A method of coupling fluid lines, comprising:

• a) providing first and second couplers, each of said first and second couplers having a coupling end and a fluid line connecting end, each of said first and second couplers comprising:
• i. an internal bore extending from said coupling end to said fluid line connecting end, said internal bore having a mouth at said coupling end;
• ii. a valve stem, wherein a first end of said valve stem comprises a coupling head of a size and shape complementary to that of said mouth of said internal bore such that a fluid tight seal is formed therebetween, wherein said fluid tight seal is broken upon movement of said valve stem along a line parallel to a longitudinal axis of said internal bore;
• iii. a support member located inside said internal bore and coupled to said valve stem, said support member operative to support said valve stem, wherein said support member is of a size and shape such that fluid passing through said internal bore passes around said support member;
• wherein said support member and said valve stem of said first coupler are coupled such that said valve stem of said first coupler cannot rotate relative to said first coupler;
• and
• wherein a portion of said valve stem of said second coupler is threaded and wherein said support member of said second coupler has a threaded hole operative to receive said threaded portion of said valve stem;
• and
• wherein said fluid line connecting end of each of said first and second couplers is coupled to a fluid line;
• b) coupling said first and second couplers by a screw action whereby said coupling ends of said first and second couplers are engaged with one another and said first and second couplers are contrarotated;
• wherein, when said first and second couplers are engaged and contrarotated, said coupling head of said first coupler is operative to engage said coupling head of said second coupler and to cause said valve stem of said second coupler to rotate in unison with said first coupler, thereby causing movement of said valve stems of said first and second couplers toward said fluid line connecting end of said first coupler and causing said fluid tight seals between said coupling heads and said mouths of said internal bores to be broken such that said internal bores are placed in fluid communication.