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Topic: Replacing holding tank roof vents (Read 837 times) previous topic - next topic - Topic derived from Re: How to check & cl...

Replacing holding tank roof vents

We have a venturi type of cap that pulls air from the tank when the wind is from the front of the coach as when going down the road. Maybe all FT's start out like this. Anyway, I want to replace them with the omnidirectional venturi type. Are these caps glued to the pipe or will this come off the roof with just removing the screws and prying them from the caulking? Not wanting to get into a bigger-than-needed project if I can help it!  :))
Larry
1996 U295 36'
Build # 4805
Actually we sold it but just like to lurk

Re: Replacing holding tank roof vents

Reply #1 –
I just replaced my refrigerator vent and it looked like the same seal on the tank vent,kind of a caulking and gasket easy to pry off.
I used the 3m sealer for gel coat.
96 U270 BUILD 4810
85 380SL
Drummonds TN.

Re: Replacing holding tank roof vents

Reply #2 –
Just remove the screws, pry off, then pull the cauking off. It is not glued to the pipe
2014 ih45  (4th Foretravel owned)
 1997 36' U295 Sold in 2020, owned for 19 years
  U240 36' Sold to insurance company after melting in garage fire
    33' Foretravel on Dodge Chassis  Sold very long time ago

Re: Replacing holding tank roof vents

Reply #3 –
Quote from: lgshoup –
...or will this come off the roof with just removing the screws and prying them from the caulking?
Yes.  Typical 10 pounds of caulking under the old vent to clean up.  If the new unit does not cover all the screw holes from old unit, you will have to fill them with something.  I used Dicor Non-Sag.

Replaced our OEM with a swiveling vent from Camco - it has been (apparently) doing the job - no stinky smells in the coach.
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: Replacing holding tank roof vents

Reply #4 –
Are there 2 vents per tank or does it draw air from the other vents via the drain piping?
Old Phart Phred, EIEIO
89 GV ored 36' #3405 300 hp cat 3208 ATAAC side radiator, mountain tamer exhaust brake

Re: Replacing holding tank roof vents

Reply #5 –
On our coach, one vent pipe up top for both holding tanks...newer coaches may have more than one?  Air flows into the tanks via "breaker" vents.

Vacuum Breaker
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: Replacing holding tank roof vents

Reply #6 –
Thanks folks, I just knew somebody had the answer. Would have used the vaned type caps but the solar panels are in the way.
Larry
1996 U295 36'
Build # 4805
Actually we sold it but just like to lurk