How long do marine sanitation hoses last?

When I redid some of my hoses, I seriously considered using rigid PVC. In the end, given the much shorter distance I had, along with not having as much of a "long, flat, run" as the bigger boats, I opted to just use all flex hose. I wanted to use the rigid stuff, but it just wasn't as feasible and any cost savings were negligible - given, again, the short distances. If you take into account the precautions mentioned above, there's no reason this can't work well. And in a larger boat, I think it makes more sense.

I would, however, try to avoid 90* corners in favor of 45* corners or flex hose for most bends. I would save the 90* fittings for where I had good access to them. I would also be inclined to add cleanouts in key areas. But I might be overthinking those points.

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Time to change them

Larry Jackel said:

How long do sanitary hoses usually last. My nose suggests that our seven year old hoses need to be replaced. Has anyone done this job on an H44? In particular, how do you snake the new hose from the forward head to the holding tank? Also there seems to be some kind of sealant where the hoses meet the fittings. What is it? I don't look forward to this job!

Goto MIC to know more.

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7 years is pushing it. The problem is that on the long horizontal runs, the crud (to be polite), stays in the lines unless you really flush them well after every use.
3 reccomendations:
Buy the best hose money can buy
Use new hose clamps, and make sure you get high quality ones.
Review the pipe fittings on the tank. It might be a good idea to unscrew them an put on fresh sealant. The pipe goop that Hunter uses can crack over time.
When putting hoses on fittings, it can be a very snug fit, and hard to do.
Dip the end of the hose in boiling hot water. It will soften up the end just
enough to make it easy to slide over the barb fittings.
To use the old hose to fish the new one through, the trick is to never risk losing the connection between hoses. If you just try and use tape, etc., that won't be strong enough.
Drill small holes in the hose walls, and connect the hoses with 1/8" line. Then wrap with duct tape to make it all run nicely in line.
Before doing this job, rinse your tanks a whole bunch of times. Then, make sure you do this on a day that you can leave all your ports and hatches open. Ventilate the boat well, or you'll regret it.

Once you're all done, write the date with marker on the hose ends. That way you, or the next owner, will know when they were changed

7 years is pushing it. The problem is that on the long horizontal runs, the crud (to be polite), stays in the lines unless you really flush them well after every use.3 reccomendations:Buy the best hose money can buyUse new hose clamps, and make sure you get high quality ones.Review the pipe fittings on the tank. It might be a good idea to unscrew them an put on fresh sealant. The pipe goop that Hunter uses can crack over time.When putting hoses on fittings, it can be a very snug fit, and hard to do.Dip the end of the hose in boiling hot water. It will soften up the end justenough to make it easy to slide over the barb fittings.To use the old hose to fish the new one through, the trick is to never risk losing the connection between hoses. If you just try and use tape, etc., that won't be strong enough.Drill small holes in the hose walls, and connect the hoses with 1/8" line. Then wrap with duct tape to make it all run nicely in line.Before doing this job, rinse your tanks a whole bunch of times. Then, make sure you do this on a day that you can leave all your ports and hatches open. Ventilate the boat well, or you'll regret it.Once you're all done, write the date with marker on the hose ends. That way you, or the next owner, will know when they were changed

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