Replacing Jabsco Joker Valve

[langstonelayabout]

I think that you (and Vyv Cox) must be lucky. I have two Jabsco heads, both are fresh water flushed, and have a holding tank head of well over one metre above them. After meticulous cleaning and replacement of flapvale and joker valve I am lucky if I can get two weeks use out of either of them before they start to backfill again. Quite often they backfill after first use. The forward heads get more use and are the worse of the two. Robin appears to have done the modification I am about to try. I am impressed with the Tru Design sea cocks I fitted 18 months ago and contacted the company in New Zealand about their non return valves, which are spring loaded but not as strongly as some, and asked about use for waste. They replied that they do not recommend them for such use but kindly sent me two to try and I am going to install the first one in September. I will be single handed sailing for over a month and should be able to give it good test as I am going to install it without changing the existing joker and flap valves which are leaking.

We don't get backfill from our twist n lok. Do you put toilet paper down your loo? Could it cause this sort of problem? (We don't throw loo paper in the pan: we call it 'going Greek')...

 

[pvb]

We don't get backfill from our twist n lok. Do you put toilet paper down your loo? Could it cause this sort of problem?

It can certainly cause a problem if there's insufficient flushing (which is often the case when there's a rapidly-filling holding tank).

 

[RichardS]

Alternatively, you may be very unlucky!

We have had two twist and lock lavvies for three years now and have never had the slightest bit of back flow in either during all this time. Holding tank is a metre above the flap valve. The previous non T & L lavs did tend to back fill once the valves aged a little.

Richard

 

[Norman_E]

We don't get backfill from our twist n lok. Do you put toilet paper down your loo? Could it cause this sort of problem? (We don't throw loo paper in the pan: we call it 'going Greek')...

Paper is never put down.

 

[vyv_cox]

Paper is never put down.

I have found that as a first step when the joker valve shows signs of leaking back, a couple of sheets of toilet paper will clear it. That's with our Jabsco lite toilet, which pounds the paper, and anything else, into small particles.

 

[ghostlymoron]

I always flush toilet paper down the bog and haven't had problems with blockages. I find that the NRVs last a couple of years before reflux becomes a problem.