To use the Exterior Cap or Not???

[Hoopy Frood]

I use the cap, and it's on after the twist-on Valterra valve. Ours does leak a bit, about a cup. With the valve it's a non issue.

[Don and Linda]

I can't speak for states other than Florida, but Florida Administrative Code Chapter 64E-15, does require the lid to be installed.

Chapter 64E-15, Florida Administrative Code
Mobile Home, Lodging, and Recreational Vehicle Parks and Recreational Camps

64E-15.004 Sewage Disposal.
(1) A safe method of sewage collection, disposal, or treatment and disposal shall be provided at each park or
camp and shall be in compliance with either Chapter 64E-6, Standards for Onsite Sewage Treatment and Disposal
Systems, or Chapter 62-600, F.A.C., Domestic Wastewater Facilities. Transportable wastewater containers and
cassette-type toilets may be used under the following conditions:
(a) The transportable wastewater container and cassette-type toilet must be specifically designed and sold for
holding and transporting wastewater, and must have a tight-capping lid and watertight connections that under
normal use will not leak or spill.
(b) Waste from hand washing sinks, kitchen sinks, and showers may be disposed of into transportable
wastewater containers. Toilet waste may not be placed into a transportable wastewater container.
(c) Cassette-type portable toilets are acceptable for the holding and transportation of toilet waste, provided the
storage container can be sealed in such a manner as to preclude leaking or spillage during transportation.
(d) Transportable wastewater containers and cassette-type toilets shall be transported to an approved disposal
site in such a manner as to preclude leakage, spillage or the creation of a sanitary nuisance.

[Gronk1]

Many times over the years I have heard it said that it is illegal to be on the highway without a cap. I have never checked to see if this actually a law as i never travel without the cap on. If something were to catch the pull handle and open the tank drain you would make quite a mess on the road and might be held liable for the cleanup, I would rather not take that chance.

I use the Valterra valve with a cap on it. Ever follow a cattle truck through a 55mph sweeping curve? It's a sight to see all the sh...tuff flowing out the trailer.

[Hoopy Frood]

Try riding a motorcycle behind one some time.

[lukskywalker]

Try riding a motorcycle behind one some time.

Thx u all who replied, after reading the mention of the vaulter valve I dawned on me seeing this mention on BTBRV channel. Again you all.

[RubiconMike]

Having had RVs with leaky valves, I always kept a cap on the sewer pipe. I put on a clear one with a garden hose fitting that holds a ball valve. That way I can see if there is any liquid in the pipe before I remove it, if there is, I can drain it through the ball valve before taking the cap off.
Clear cap with hose connection (https://www.amazon.com/Valterra-T102...dp/B00ON6GH3G/)
Garden hose ball valve (https://www.amazon.com/gp/product/B081NHL9FC/)

On my 2670MK, I decided to try adding the Valterra twist-on waste valve, it fits pretty close and doesn't seem to stick out much.
External waste valve (https://www.amazon.com/gp/product/B000BGHYJS)

Here's a picture of everything together.

[Riley 1841]

Having had RVs with leaky valves, I always kept a cap on the sewer pipe. I put on a clear one with a garden hose fitting that holds a ball valve. That way I can see if there is any liquid in the pipe before I remove it, if there is, I can drain it through the ball valve before taking the cap off.
Clear cap with hose connection (https://www.amazon.com/Valterra-T102...dp/B00ON6GH3G/)
Garden hose ball valve (https://www.amazon.com/gp/product/B081NHL9FC/)

On my 2670MK, I decided to try adding the Valterra twist-on waste valve, it fits pretty close and doesn't seem to stick out much.
External waste valve (https://www.amazon.com/gp/product/B000BGHYJS)

Here's a picture of everything together.

Ditto to above.

[jlk111]

I use the Valterra valve with a cap on it. Ever follow a cattle truck through a 55mph sweeping curve? It's a sight to see all the sh...tuff flowing out the trailer.

I use a clear Valterra cap I purchased on Amazon. No "unseen" surprises behind cap. If there is a little bit of liquid behind the cap I open it slowly and drain into slinky hose or use a 10 gallon trash bag for a bigger volume of "stuff".

[Capt Jim]

There is an additional advantage to adding the Valtera valve. If you have dual grey tanks as I do, you can equalize the contents if, say, your bathroom tank gets full. With the external valve closed, you can open both grey tank drains and use the total volume of both tanks. Safe Travels.

[Riverbug]

There is an additional advantage to adding the Valtera valve. If you have dual grey tanks as I do, you can equalize the contents if, say, your bathroom tank gets full. With the external valve closed, you can open both grey tank drains and use the total volume of both tanks. Safe Travels.

I assume you mean you can do this if you put a pipe between the two tanks? Our new 23LDE has two tanks but I haven't looked up in the belly yet to see how everything is arranged but I assume the two tanks are not connected coming from the factory?