Rubbish waste tap! 28mm with internal of 16mm (1 Viewer)

Pusscat

Free Member
Jun 16, 2019
295
751
Devon UK
Funster No
61,683
MH
Swift Rio 320
Exp
Since 2015
I think some of us have been here before. You’ve pulled up to the grey water drain point, started to offload and someone has just pulled up behind you…🙁

After a few mins, you get into a heated discussion with your driving ‘companion’ along the lines of “hurry up”, “it must be empty by now…” and finally to “let’s drive off and come back later”. Of course the other side of the argument is usually “there’s still half a tank to go”, “it’ll be done when it’s done”, through to “they’ll just have to wait!”.

I’ve finally got round to having a look at the waste drainage with hopes of speeding things up. I was going to add new pipes, new valve taps etc etc until I decided to pull the grey tap apart.

it’s easy to do, you just line a lug up to a spacer and pull…comes out nice and easy.

My problem has been two fold. The bit inside the tap that let’s waste out when it’s turned has an exit hole of just 16mm…that’s on a 28mm tap.

Why?!?

Also, behind this choke we’re a couple of bobbles of manky gooey bits stuck that were slowing things down even more.

I’ve enlarged the 16mm hole to the same as the internal bore of the outlet and put it all back together. Also took the time to replace steel jubilee clips with stainless steel ones (paid a bit extra for the original jubilee make, they are far sturdier than the knock offs) as the old ones had completely seized and I wanted to be able to replace the flexible pipe easily if I ever needed to en route anywhere.

What a difference….the van has gone into young stallion mode!

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Apr 20, 2022
667
1,254
Brighouse, UK
Funster No
88,205
MH
Autoquest 155 2016
Exp
Since 2020
Is that a quarter or half turn valve? If it’s quarter I would guess that it won’t seal when shut.
 

Ridgeway

LIFE MEMBER
Mar 10, 2012
3,688
6,254
Lausanne
Funster No
20,102
MH
NiBi Arto 85E
Exp
Since 2012
40mm PVC pipe with 40mm ball valve (they are 32mm inside) but still enough. You could add a 50mm BV if you wanted to empty with ultra high speed😉
 

MisterB

LIFE MEMBER
Feb 25, 2018
6,104
13,692
Essex
Funster No
52,564
MH
Adria 670 SLT
Exp
enough to know i shouldnt touch things i know nothing about ....
It's not your issue, its the way the motorhome has been built. Don't feel guilty. If the person behind you is impatient that's their problem.

Think of it like this, if your tank was 200l it takes twice as long to empty BUT it takes twice as long to fill, so you're not spending any more time there (overall) than anyone else is!

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May 14, 2018
331
430
Lincolnshire, UK
Funster No
53,891
MH
Autograph 794-T
Exp
Caravan owner moved on to Motorhome
Yup.. likewise except fitted a 28mm one.
I find these plastic grey waste taps cease and are difficult to turn after a while.

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