No, you can't access the "in tank spray head" from the outside. The way the tank flush system is constructed, there is a 1/2" PEX tube that runs from the outside connection (where you hook up the hose) to a "anti-siphon valve" (usually located under the bathroom sink) and from there, another 1/2" PEX tube runs to the black tank where it connects to the spray head on the outside wall of the black tank. It sounds like you've never used the system and don't know if it has ever worked or not. There are several possible problems. First I'd suspect that the anti-siphon valve may be installed backwards. Locate it, unscrew it, turn it around and reinstall it. Try the water at very low pressure. If it works, make sure you don't have leaks and then proceed to flush your black tank. ALWAYS USE A PRESSURE REGULATOR WITH THE SYSTEM!!!
If that doesn't work, the next potential problem is tissue and "black tank gunk" dried around the spray head, effectively clogging it and preventing water from flowing through the holes. The "fix" is to fill the black tank with water, let it sit for several days and hope that it softens the "gunk". Then empty the black tank and try the system to see if it will push water through the holes and clear the clog.
The third is a mechanical blockage in one of the PEX tubes. If the system has never worked, it's possible that during installation one of the PEX tubes was crimped and is preventing water flow through the system. You'll have to remove the bottom lining of the trailer to visually check for crimps. I'd exhaust all other possibilities before considering this problem. Chances are it's not this since most people would have noticed the problem and had it repaired during the warranty. PEX doesn't "just crimp" at any given time, so it if ever worked, it's probably not crimped now.
Let us know what you find and good luck....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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