Single use dispense head with key code

1. A method of field installing a keying system to a container and a dispensing system, comprising:

providing a first key ring that includes a plurality of protrusions, said plurality of protrusions defining a protrusion pattern;

providing a second key ring that defines a plurality of pockets, said plurality of pockets defining a pocket pattern that is complementary to said protrusion pattern of said first key ring; and

providing a set of instructions on a tangible medium, said instructions comprising:

coupling one of said first key ring and said second key ring to a dispense head;

coupling the other of said first key ring and said second key ring to a bung of said container, such that the other of said first key ring and said second key ring freely rotates about an exterior of a neck portion of said bung;

coupling said dispense head having said one of said first key ring and said second key ring coupled thereto with said bung having the other of said first key ring and said second key ring coupled thereto, so that said protrusion pattern is engaged within said pocket pattern; and

coupling said dispense head to said bung.

2. The method of claim 1 , wherein said first key ring is an inner key ring and said second key ring is an outer key ring, said inner key ring being surrounded by said outer key ring when said protrusion pattern is engaged within said pocket pattern.

3. The method of claim 2 , wherein said outer key ring includes a flange portion that extends radially inward from a perimeter portion to define an inner radius.

4. The method of claim 3 , wherein said bung includes external threads that define an outer radius, said outer radius being greater than said inner radius of said flange portion.

5. The method of claim 4 , wherein said flange portion includes structure that defines a plurality of slots that extend radially outward from the inner radius.

6. The method of claim 1 , further comprising

providing a guard for insertion into said bung, said guard covering an opening of said bung to prevent particulates from entering said container,

wherein said instructions provided in the step of providing instructions include:

inserting said guard into said bung before the step of coupling the other of said first key ring and said second key ring to said bung of said container; and

removing said guard from said bung after said step of inserting and before the step of coupling said dispense head with said bung.

7. The method of claim 4 , further comprising:

providing a guard for insertion into said bung, said guard covering an opening of said bung to prevent particulates from entering said container; and

providing an assembly tool adapted to contact said outer key ring while said outer key ring is coupled to said bung of said container and while said guard is inserted within said bung,

wherein said instructions provided in the step of providing instructions include:

inserting said guard into said bung before the step of coupling the other of said first key ring and said second key ring to a bung of said container;

engaging said assembly tool with said outer key ring while said outer key ring is coupled to said bung of said container and while said guard is inserted within said bung;

exerting a force on said assembly tool while said assembly tool is engaged with said outer key ring, causing said flange portion of said outer key ring to course over said external threads of said bung; and

after said step of exerting, removing said assembly tool from engagement with said outer key ring and said guard from said bung.

8. The method of claim 1 , further comprising:

providing a first key ring portion and a second key ring portion to joined together to form one of said first key ring and said second key ring, and

wherein said instructions provided in the step of providing instructions include:

positioning said first key ring portion and said second key ring portion proximate said neck portion of said bung; and

joining said first key ring portion to said second key ring portion so that said first key ring portion and said second key ring portion form one of said first key ring and said second key ring that surrounds said neck portion of said bung.

9. The method of claim 8 , wherein said first key ring portion and said second key ring portion include at least one clasping structure to join said first key ring portion to said second key ring portion.

10. The method of claim 8 , wherein said first key ring portion and said second key ring portion are separate components.

11. A field installation kit for keying a container and a dispensing system, comprising:

a first key ring that includes a plurality of protrusions, said plurality of protrusions defining a protrusion pattern; and

a second key ring that defines a plurality of pockets, said plurality of pockets defining a pocket pattern that is complementary to said protrusion pattern of said first key ring, said protrusion pattern being configured to mesh within said pocket pattern,

wherein one of said first key ring and said second key ring is adapted for coupling with a dispense head, the other of said first key ring and said second key ring is adapted for coupling with a bung of said container, the other of said first key ring and said second key ring being configured to freely rotate about an exterior of a neck portion of said bung.

12. The field installation kit of claim 11 , wherein said first key ring is an inner key ring and said second key ring is an outer key ring, said inner key ring being surrounded by said outer key ring when said protrusion pattern is engaged within said pocket pattern.

13. The field installation kit of claim 12 , wherein said outer key ring includes a flange portion that extends radially inward from a perimeter portion to define an inner radius.

14. The field installation kit of claim 13 , wherein said bung includes external threads that define an outer radius, said outer radius being greater than said inner radius of said flange portion.

15. The field installation kit of claim 14 , wherein said flange portion includes structure that defines a plurality of slots that extend radially outward from the inner radius.

16. The field installation kit of claim 11 , further comprising a guard for covering an opening of said bung to prevent particulates from entering said container.

17. The field installation kit of claim 16 , further comprising

an assembly tool adapted surround said guard and to contact said outer key ring.

18. The field installation kit of claim 11 , further comprising:

a first key ring portion and a second key ring portion that are joined together to form one of said first key ring and said second key ring.

19. The field installation kit of claim 18 , wherein said first key ring portion and said second key ring portion include at least one clasping structure to join said first key ring portion to said second key ring portion.

20. The field installation kit of claim 18 , wherein said first key ring portion and said second key ring portion are separate components.

21. The field installation kit of claim 18 , wherein said first key ring portion and said second key ring portion are hinged together to form a clamshell arrangement.