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Old 07-12-2022, 01:37 PM   #1
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Brand: Thor Motor Coach
State: Maryland
Posts: 2
THOR #25708
Check valve location in Thor Majestic 23A

I have a 2015 Thor Majestic 23A and it has a leak.
I suspect the city water check valve; i.e. there are two check valves, one from water tank and one from city water intake.
I cannot find either, after removing all the panels. Thor only gives a generic plumbing diagram showing how things connect, but not where they are. The city water connection is on left rear side, and appears to wind its way under shower and rear bed, but there is no obvious way to get at it.
I also cannot 'see' (after removing the access panels) where the inside water tanks check valve is located.
I fear it will be thousands of dollars for a dealer to fix this, for replacing a $10 part.

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Old 07-12-2022, 03:56 PM   #2
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Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 4,157
THOR #6411
Quote:
Originally Posted by Martinbatts View Post
I have a 2015 Thor Majestic 23A and it has a leak.
I suspect the city water check valve; i.e. there are two check valves, one from water tank and one from city water intake.
I cannot find either, after removing all the panels. Thor only gives a generic plumbing diagram showing how things connect, but not where they are. The city water connection is on left rear side, and appears to wind its way under shower and rear bed, but there is no obvious way to get at it.
I also cannot 'see' (after removing the access panels) where the inside water tanks check valve is located.
I fear it will be thousands of dollars for a dealer to fix this, for replacing a $10 part.
On my coach, the city water check valve in the hose to PEX adapter screwed onto the side of the coach. water 's back-flow preventer is in the pump itself it is part of the replaceable head.
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Old 07-12-2022, 06:12 PM   #3
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Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,129
THOR #7035
Both check valves are "integrated" check valves.

The city water check valve is in the city water connection.

The water pump "check valve" is integrated into the design of the pump.
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