New jabsco toilet install

[Johnny5]

Hi
After my resent refit I stupidly re- fitted the old toilet that I have now found has a few problems so I have now purchased a new jabsco to replace it with
Originally the toilet was under a bunk so the top of the toilet only about 6" above the waterline "if that" it had no loops in the pipework of any kind
I have since built a dedicated head compartment and the toilet is now on a plinth so the bottom of the toilet is level with the waterline
My question is do I need to have a loop of pipe above the toilet or can I just come into the fitting at a right angle to take the shortest route?
And is this the same for the inlet pipe ?

 

[PaulRainbow]

https://www.jamestowndistributors.com/userportal/document.do?docId=768

Scroll down to figure 2

 

[Johnny5]

I have the installation instructions but what I'm saying is when the old one was under the front bunk it had no high loops in the connecting pipework
In my new position the toilet will be above the waterline and the instructions say
YOU MAY fit a vented loop but it's not clear if it's necessary

 

[lpdsn]

Worth fitting the vented loops if at all possible even if the previous owner didn't. I've never found the waterline of my boat that static when out at sea.

 

[VicS]

I have the installation instructions but what I'm saying is when the old one was under the front bunk it had no high loops in the connecting pipework
In my new position the toilet will be above the waterline and the instructions say
YOU MAY fit a vented loop but it's not clear if it's necessary

The link PR has given explains it all.



The vented loop is not necessary in the inlet pipe if the toilet top is always above the waterline, but a non return valve may be required in the connection between the seacock and the toilet to ensure the pump remains primed.

A vented loop will still be desirable in the outlet pipe to prevent the toilet draining completely. It is literally a PITA if you are desperate for a "no2" but have to faff about pumping some water into the bowl first.


BTW
Note that when the toilet is installed with a vented loop in the inlet it replaces the short connection normally supplied fitted between the pump and the toilet. If its fitted between the seacock and the pump you will just suck in air when you try to flush it