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Old 07-27-2015, 04:23 PM   #1
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Second Black water tank

Does anyone know how hard it is to get the second blackwater tank in the rear on a Thunderbolt 425 I want to add a black tank flush to it?
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Old 07-27-2015, 05:20 PM   #2
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I don't know about the 425 but I did add one to my back black tank on the 380 ,Took maybe a hour.
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Old 07-27-2015, 05:35 PM   #3
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Did you drop the bottom plastic and did you have the fuel station?


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Old 07-28-2015, 01:54 PM   #4
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I cut a access hole in plastic, Yes I do have a fuel tank,I used a right angle drill with a hole saw bit on it drilled as close to opposite side of discharge outlet as I could ,ran a bead of sealant,install black tank flush,ran hose to underside of Rv so it was easy to hook up hose to flush,screwed plastic sheathing in place,taped joints,done. Note my back black tank also hold waste water from kitchen sink and 1/2 bath sink so it really doesn't get to dirty,I just like that I can really clean them good when I want too.
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Old 07-28-2015, 03:14 PM   #5
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I hate to ask but you didn't happen to take any pictures of the hole and how you installed this did you?
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Old 07-28-2015, 04:06 PM   #6
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No,I didn't take no pics,But it was a easy job.i ordered it thru Amazon for less than $25.00.
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Old 07-28-2015, 04:45 PM   #7
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Ok thanks
How did you determine where to cut through the belly to get to the tank?


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Old 07-28-2015, 06:02 PM   #8
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I pulled some of the screws out of plastic underbelly and looked to see how tank was placed in the frame,On mine I only had to come in about 16" from the side so I just cut a flap in the underbelly and accessed the tank from there.
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