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When assembling the threaded cap, a back-up wrench should be used on the adapter to avoid torque being applied to the reservoir body. High torque should not be needed to achieve a full seal with properly prepared threads. See Figure 3. Figure 3 The LCX containment system is UL Listed for pressure to 40 psi. Standard test procedures would apply. For reservoirs connected by tubes from the Shrader valve on the final termination sleeve, standard air testing procedures apply. After the pressure test is completed, the threaded end cap should be removed for systems with direct connected reservoirs. It will not be needed for further work. For systems connected with tubes, the valve stem from the Shrader valve should be removed to allow unrestricted flow of the brine during fill and during operation. IV. Charging System with Brine The key to charging the system is to assure the brine displaces all the air from the interstitial volume. Trapped air in the system will cause greater level changes in the reservoir during temperature fluctuations than would occur with a fully purged system. Brine will flow readily through the interstitial space in the pipe. Because the space is small and filled with sand particles, there will be some resistance. Brine can be introduced simply by gravity flow. This may take longer than desired (an hour or more, depending on the size of the site). Brine can be pumped into the system with a small, hand-held piston or peristaltic pump. Only a few psi. is needed to greatly enhance the flow. Brine should be introduced into the system at its lowest point (the tank sump) and fill to its highest point (the furthest dispenser). One key to the successful filling of the system is that every termination sleeve should have a test port (Shrader valve). It may be preferred to have each half of some of the termination sleeves equipped with a Shrader valve — one to drain and one to vent.