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A penetration fitting for forming a sealed connection between a conduit and a containment structure in an underground storage tank fueling system is provided that includes a main fitting element for forming a sealed connection to each of the conduit and the containment structure, wherein the main fi

A penetration fitting for forming a sealed connection between a conduit and a containment structure in an underground storage tank fueling system is provided that includes a main fitting element for forming a sealed connection to each of the conduit and the containment structure, wherein the main fitting element includes an interstitial space that is in fluid communication with each of the conduit and the containment structure. In one embodiment a monitoring fluid is disposed in the interstitial space and a sensor is used to monitor the level of the monitoring fluid.

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1. A penetration assembly for forming a sealed connection between a conduit and a containment sump in an underground storage tank fueling system, the penetration assembly comprising:a main fitting element for forming a sealed connection to each of the conduit and the containment sump, the main fitti

1. A penetration assembly for forming a sealed connection between a conduit and a containment sump in an underground storage tank fueling system, the penetration assembly comprising:a main fitting element for forming a sealed connection to each of the conduit and the containment sump, the main fitting element including an interstitial space that is in fluid communication with an interstitial space in each of the conduit and the containment sump. 2. The penetration assembly of claim 1, wherein the conduit is a double walled product pipeline having an interstitial space and the containment structure is a double walled structure having an interstitial space, and wherein the main fitting interstitial space is in fluid communication with each of the product pipeline interstitial space and the containment structure interstitial space.3. The penetration assembly of claim 2, wherein the main fitting element includes an outer portion having a first sealing surface for sealing to the containment structure and a second sealing surface for sealing to the product pipeline, and wherein the main fitting element includes an inner portion threadably engaged to at least one clamp for securing the first sealing surface to the containment structure and the second sealing surface to the product pipeline.4. The penetration assembly of claim 3, wherein the outer portion includes a fusion socket and at least one electrode, wherein the fusion socket is electrically connected to the at least one electrode such that a charge supplied to the at least one electrode from the fusion socket produces heat for fusing the first sealing surface to the containment structure and the second sealing surface to the product pipeline.5. The penetration assembly of claim 4, wherein the at least one clamp includes a clamp fusion socket and at least one clamp electrode, wherein the clamp fusion socket is electrically connected to the at least one clamp electrode such that a charge supplied to the at least one clamp electrode from the fusion socket produces heat for fusing a first surface of the at least one clamp to the inner portion of the main fitting element and a second surface of the at least one clamp to the product pipeline.6. The penetration assembly of claim 4, wherein the at least one clamp includes an inner clamp threadably engaged with a first side of the inner portion of the main fitting element and an outer clamp threadably engaged with a second side of the inner portion of the main fitting element, wherein the inner clamp includes an inner clamp fusion socket and at least one inner clamp electrode such that a charge supplied to the at least one inner clamp electrode from the inner clamp fusion socket produces heat for fusing a first surface of the inner clamp to the first side of the inner portion of the main fitting element and a second side of the inner clamp to the product pipeline, and wherein the outer clamp includes an outer clamp fusion socket and at least one outer clamp electrode such that a charge supplied to the outer clamp electrode from the outer clamp fusion socket produces heat for fusing a first surface of the outer clamp to the second side of the inner portion of the main fitting element and a second side of the outer clamp to the containment structure.7. The penetration assembly of claim 2, further comprising a coupling engaged with the interstitial space of the main fitting element and having a first position for occluding the interstitial space of the main fitting element and a second position allowing fluid communication through the interstitial space of the main fitting element.8. The penetration assembly of claim 1, wherein the main fitting element is composed of a rigid material.9. The penetration assembly of claim 8, wherein the rigid material is chosen from the group consisting of a high density polyethylene and a fiberglass reinforced plastic.10. The penetration assembly of claim 1, wherein the conduit is an electrical conduit having an outer surface and the containment structure is a double walled structure having an interstitial space, and wherein the main fitting interstitial space is in fluid communication with each of the electrical conduit outer surface and the containment structure interstitial space.11. An underground storage tank fueling system comprising:a product pipeline comprising a primary pipeline, a secondary pipeline and a product pipeline interstitial space extending therebetween; a containment sump having an inner wall, an outer wall and a containment sump interstitial space extending therebetween; and a penetration fitting forming a sealed connection with the conduit and the containment sump to sealingly connect the conduit to the containment sump, wherein the penetration fitting comprises a penetration fitting interstitial space that is in fluid communication with each of the product pipeline interstitial space and the containment sump interstitial space, forming a contiguous interstitial pathway between the product pipeline interstitial space and the containment sump interstitial space. 12. The system of claim 11, wherein the conduit comprises a product pipeline having a primary pipeline, a secondary pipeline and a product pipeline interstitial space therebetween, and wherein the penetration fitting interstitial space is in fluid communication with each of the product pipeline interstitial space and the containment structure interstitial space, forming a contiguous interstitial pathway between the product pipeline interstitial space and the containment structure interstitial space.13. The system of claim 12, further comprising a monitoring fluid disposed in the contiguous interstitial pathway and a sensor communicating with the monitoring fluid to monitor the level of the monitoring fluid.14. The system of claim 12, further comprising a gas disposed in the contiguous interstitial pathway and a sensor communicating with the gas to monitor the pressure in the contiguous interstitial pathway.15. The system of claim 12, wherein the penetration fitting comprises a first fusion socket and at least one first electrode adjacent to the product pipeline, wherein a charge supplied to the at least one first electrode from the first fusion socket produces heat that fuses a first portion of the penetration fitting to the product pipeline, and wherein the penetration fitting comprises a second fusion socket and at least one second electrode adjacent to the product pipeline, wherein a charge supplied to the at least one second electrode from the second fusion socket produces heat that fuses a second portion of the penetration fitting to the containment structure.16. The system of claim 12, further comprising a coupling engaged with the penetration fitting interstitial space and having a first position for occluding the interstitial space to occlude a portion of the contiguous interstitial pathway thus preventing communication between the product pipeline interstitial space and the containment structure interstitial space and a second position that does not occlude the contiguous interstitial pathway and allows a communication between the product pipeline interstitial space and the containment structure interstitial space.17. The system of claim 11, wherein the penetration fitting is composed of a rigid material.18. The system of claim 12, wherein the product pipeline comprises an offset collar that forms a first angle between a radial axis of the product pipeline and a radial axis of the offset collar.19. The system of claim 18, wherein the product pipeline comprises an insertion angle defined as an angle between a longitudinal axis of the product pipeline and a line that is perpendicular to a wall of the containment structure, wherein the insertion angle is variable by rotating the offset collar about a longitudinal axis of the offset collar.20. The system of claim 19, wherein the insertion angle is variable from an angle of approximately 0° to an angle of approximately two times the first angle by rotating the offset collar about a longitudinal axis of the offset collar.21. The system of claim 11, wherein the conduit is an electrical conduit having an outer surface, and wherein the penetration fitting interstitial space is in fluid communication with each of the electrical conduit outer surface and the containment structure interstitial space, forming a contiguous interstitial pathway between the electrical conduit outer surface and the containment structure interstitial space.22. The system of claim 21, further comprising a monitoring fluid disposed in the contiguous interstitial pathway and a sensor communicating with the monitoring fluid to monitor the level of the monitoring fluid.23. The system of claim 21, further comprising a gas disposed in the contiguous interstitial pathway and a sensor communicating with the gas to monitor the pressure in the contiguous interstitial pathway.24. A method for detecting leaks in an underground storage tank fueling system comprising:providing a product pipeline comprising a primary pipeline, a secondary pipeline and a product pipeline interstitial space extending therebetween; providing a containment sump having an inner wall, an outer wall and a containment sump interstitial space extending therebetween; and sealingly connecting a penetration fitting to the conduit and to the containment sump to sealingly connect the conduit to the containment sump; forming an interstitial space in the penetration fitting that is in fluid communication with each of the product pipeline interstitial space and the containment sump interstitial space, forming a contiguous interstitial pathway between the product pipeline interstitial space and the containment sump interstitial space. 25. The system of claim 24, wherein the conduit comprises a product pipeline having a primary pipeline, a secondary pipeline and a product pipeline interstitial space therebetween, and wherein the penetration fitting interstitial space is in fluid communication with each of the product pipeline interstitial space and the containment structure interstitial space, forming a contiguous interstitial pathway between the product pipeline interstitial space and the containment structure interstitial space.26. The method of claim 25, further comprising providing a monitoring fluid in the contiguous interstitial pathway and providing a sensor communicating with the monitoring fluid to monitor the level of the monitoring fluid.27. The method of claim 25, further comprising providing a gas in the contiguous interstitial pathway and providing a sensor communicating with the gas to monitor the pressure in the contiguous interstitial pathway.28. The method of claim 24, wherein the conduit is an electrical conduit having an outer surface, and wherein the penetration fitting interstitial space is in fluid communication with each of the electrical conduit outer surface and the containment structure interstitial space forming a contiguous interstitial pathway between the electrical conduit outer surface and the containment structure interstitial space.29. The method of claim 28, further comprising providing a monitoring fluid in the contiguous interstitial pathway and providing a sensor communicating with the monitoring fluid to monitor the level of the monitoring fluid.30. The method of claim 28, further comprising providing a gas in the contiguous interstitial pathway and providing a sensor communicating with the gas to monitor the pressure in the contiguous interstitial pathway.31. The penetration assembly of claim 1, wherein the containment sump is an underground storage tank.32. The system of claim 11, wherein the containment sump is an underground storage tank.33. The method of claim 24, wherein the containment sump is an underground storage tank.34. The penetration assembly of claim 1, wherein the containment sump is a product dispenser containment sump.35. The system of claim 11, wherein the containment sump is a product dispenser containment sump.36. The method of claim 24, wherein the containment sump is a product dispenser containment sump.