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Old 10-07-2020, 10:51 PM   #1
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Draining ClassACustoms freshwater tank with 1.5" drain hole

Hey guys,

Not sure if anyone else here has run into this issue with their ClassACustoms freshwater tank. The tank they sent me has 4 openings, two 1/2" openings (for air vent and line to water pump), and two 1.5" openings (for water fill and water drain). I would like to be able to drain the tank with a hose, but I can't seem to find a fitting that reduces from 1.5" to a 1/2" fitting for my pex line to go into. Does anyone have a suggestion for what fitting to use or have any experience draining another way? I am looking to run the drain line out from the water tank to the rear emergency exit.

Thanks a lot.
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Old 10-08-2020, 12:05 AM   #2
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Shouldn’t you be able to find a barb fitting like that? Or a bushing
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Old 10-08-2020, 01:49 AM   #3
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Originally Posted by kellin View Post
Hey guys,

Not sure if anyone else here has run into this issue with their ClassACustoms freshwater tank. The tank they sent me has 4 openings, two 1/2" openings (for air vent and line to water pump), and two 1.5" openings (for water fill and water drain). I would like to be able to drain the tank with a hose, but I can't seem to find a fitting that reduces from 1.5" to a 1/2" fitting for my pex line to go into. Does anyone have a suggestion for what fitting to use or have any experience draining another way? I am looking to run the drain line out from the water tank to the rear emergency exit.

Thanks a lot.
Sounds like you're already using the half inch opening for supply, so the only thing you have left is the inch and a half opening, correct?

There's no single fitting that does that to my knowledge, but if you want to completely drain the tank consider an inch and a half plug with a half inch NPT opening at the bottom of the plug.
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Old 10-24-2020, 08:09 PM   #4
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Use reducing bushings to get from the 1.5" to .5" FIP then a .5" PEX-MIP.
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