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Old 08-24-2013, 09:13 PM   #1
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Changing pex to flexible line

I was doing some work on the camper in hopes of quieting the water pump. I stuck a mouse pad under the pump to isolate it from the wall it is mounted to. I found a thread about mounting the pump on some foam sandwiched between some luan that I may also do, but I need to check on space as it is a bit tight where our pump is located. I also found that the hard pex line was causing the majority of the noise. I want to add a piece of flex line to the pump and was looking for some tips on how to do it. The pump connection looks like a standard 5/8 hose connection. Are there adapters available that can go to the pex? I remember seeing some plumbing fittings a few years back that were for copper, pvc, or pex. I think they were called shark(brand) fittings. Anyone care to share what they used to accomplish this? I am planning a trip to the hardware store tomorrow looking for ideas.
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Old 08-24-2013, 09:50 PM   #2
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Changing pex to flexible line

Instead of messing with replacing the PEX, do you have room enough on the lines that are making the noise to install some pipe foam insulation?
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Old 08-24-2013, 10:49 PM   #3
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I put the pipe foam on already. The problem is when the factory ran the lines they have them so tight against a shelf in the cabinet that it still vibrates the shelf even with the foam on it. The drain line for the sink, and the shelf vibrate like crazy when the pump is turned on.
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Old 08-25-2013, 08:00 AM   #4
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Originally Posted by jenoble99 View Post
I was doing some work on the camper in hopes of quieting the water pump. I stuck a mouse pad under the pump to isolate it from the wall it is mounted to. I found a thread about mounting the pump on some foam sandwiched between some luan that I may also do, but I need to check on space as it is a bit tight where our pump is located. I also found that the hard pex line was causing the majority of the noise. I want to add a piece of flex line to the pump and was looking for some tips on how to do it. The pump connection looks like a standard 5/8 hose connection. Are there adapters available that can go to the pex? I remember seeing some plumbing fittings a few years back that were for copper, pvc, or pex. I think they were called shark(brand) fittings. Anyone care to share what they used to accomplish this? I am planning a trip to the hardware store tomorrow looking for ideas.
I have used this kit before. http://www.amazon.com/SHURflo-94-591.../dp/B000WN5F96
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Old 08-25-2013, 12:55 PM   #5
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You don't say what year your RV is but I took ours to the dealer and let them fix it under warranty. Same problem, one line was flex, the other was pex (hey, that rhymes) and very noisy.
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Old 08-25-2013, 01:41 PM   #6
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They have kits at camping supply stores for isolating the lines with flexible hose. No new fittings, all bolt on.

I bought one for my new rig and when I looked at it, the factory had already installed flexible hoses on either side of the pump.
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Old 08-25-2013, 03:32 PM   #7
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You don't say what year your RV is but I took ours to the dealer and let them fix it under warranty. Same problem, one line was flex, the other was pex (hey, that rhymes) and very noisy.
Ours is the same way. One side is pex and one side is a flexible line. The dealer did a warranty repair to take care of it? May have to call our dealer tomorrow to see if that is an option.
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Old 08-25-2013, 04:10 PM   #8
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They have kits at camping supply stores for isolating the lines with flexible hose. No new fittings, all bolt on.

I bought one for my new rig and when I looked at it, the factory had already installed flexible hoses on either side of the pump.
I have seen multiple kits for this purpose. However, they all have the same fitting one each end. I haven't seen a kit that allows an easy connection to the pex line. I found the shark bite fittings in our local Acr hardware, and I also found a pex crimper that I can borrow, so I am going to look at those two options.
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Old 08-25-2013, 05:27 PM   #9
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Are the couplers in the silencing kit the same thread connection as what is on the water pump? If those will join the flex line with the pex I may be able to make it work. I am very limited on space in the area our pump is mounted in, but the pex outlet has a bend in it to join the pump. If I take that loose from the pump I will likely be able to make enough loops in the flex line to get it on there. I was planning on trimming the pex back, but may try it first without trimming. I am also looking at moving the pump to the floor if space is available. The two heat ducts in the area may eliminate that possibility though.
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Old 08-25-2013, 05:58 PM   #10
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Try that first and you may be able to save some headache. You can re-locate the pump and put a better shock mount under it and maybe make it a little more accessible. The kit that I bought had threaded fittings that fit on the PEX end and then another that threaded into the flex extension. It should help.

Also, every where the pipe touches something, slip some foam pipe insulation over it to shield the vibration from being transferred to the trailer.

Mine is still noticeable but some better.

Here is the kit: http://search.yahoo.com/r/_ylt=A0oG7.../dp/B000WN5F96
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