Plumbing vent cap April 02, 2013, 05:45:32 pm Yahoo Message Number: 137984While on the roof I noticed a slight reddish stain alongside the metal vent cap at the toilet location. The round cap appeared ok but when I touched the lip of the stack a rusted piece of it fell away onto the roof. I see that they have plastic ones and metal. Other than UV working on the plastic is there any advantage to metal over plastic?Jim C
Re: Plumbing vent cap Reply #1 – April 02, 2013, 11:00:37 pm Yahoo Message Number: 137996Why bother with a vent cap ? Ever see one on a house ? Just make sure the vent pipe is well sealed.Dave W still sitting
Re: Plumbing vent cap Reply #2 – April 03, 2013, 12:22:29 pm Yahoo Message Number: 138001QuoteWhy bother with a vent cap ? Ever see one on a house ? Just make sure the vent pipe is well sealed. What!... Do you mean sealing off the vent or around the mounting? Anyway, the roof vent on a house collects rainwater and dumps it into the sewer system. On the rig, it would collect in the tanks, which have a limited enough capacity. Keep the cap.Steve
Re: Plumbing vent cap Reply #3 – April 03, 2013, 11:02:14 pm Yahoo Message Number: 138011I kinda figured that it would be clear to most that I meant the vent pipe penetration thru the roof be well sealed, sorry for my short sightedness.How much water
Re: Plumbing vent cap Reply #4 – April 04, 2013, 12:04:30 am Yahoo Message Number: 138012"I kinda figured that it would be clear to most that I meant the vent pipe penetration thru the roof be well sealed, sorry for my short sightedness. How much water in your tank do you figure you'll get from a inch of rain ?"Dave A RV-style vent cap allow vertical movement of the vent pipe and is a proven item, used on millions of RVs. I'm not too worried about a little rain water entering the vent pipe, being much more concerned about maintaining a constant seal between the vent pipe and the roof, a leak there could be costly. RV vent caps are designed for the this application and are available at any RV store, I have even seen them at Wal-Mart. It's a $3.00 item, splurge. http://www.rvplus.com/hengs-industries-plumbing-vent-col-wht-10002-c.html?utm_source=shopzilla&utm_medium=cpc&utm_campaign=rv_shopzillaLarry
Re: Plumbing vent cap Reply #5 – April 04, 2013, 01:19:43 am Yahoo Message Number: 138015Rather than rain, maybe it has something to do with driving down the road at 60 mph, something you don't usually do in your stick-built home. Could it sound like a big organ pipe, or force fumes into the vehicle?Eric Greenwell
Re: Plumbing vent cap Reply #6 – April 04, 2013, 12:03:38 pm Yahoo Message Number: 138018I appreciate the responses. However, I was curious as to the pros and cons of plastic vs metal. I realize that UV works on plastic although I used 303 on other plastic items and I see what the downside is on the metal. I am also puzzled on why this has rusted in the first place. I saw some comments elsewhere and someone stated that these should last the life of the rig. I don't see any evidence of rusting on the others. Also, in case I wasn't clear it isn't the rounded cap that is rusting and breaking apart but the lip of the vertical pipe under the cap.Jim C
Re: Plumbing vent cap Reply #7 – April 04, 2013, 03:12:00 pm Yahoo Message Number: 138019My suspicion is that the top couple inches of the pipe condenses water and is always moist. Maybe not while driving. They say rust never sleeps.John
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Topic: Plumbing vent cap (Read 7 times)
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