Use a peristaltic or diaphragm pump. The diaphragm pump would use check valves for inlet and outlet but could easily be metallic. Alternative would be to use seals suitable for WD40, a seal specialist could make recommendations based on its chemical constituents.

Why not use a funnel?

I would not go with a peristatic pump unless you change the tube from the usual silicon to one that can resist hydrocarbons. That is what is in the WD40 that can make silicon and rubber swell much the same teason you use the yellow Tygon tube for model engines running on petrol not the usual silicon.

Also check what any diaphram is made from.

Trick us to pour with the handle at the bottom so the spout is more horizontal before it starts to flowthen you don’t get it running back down the 5lts container. You can also buy pouring lips and spouts to fit 5lts containers which makes clean pouring easier.

Hi, +1 for JasonB’s method of poring 5lt containers.

Regards Nick.

On 8 September 2024 at 17:30 Nick Wheeler Said:

Why not use a funnel?

What a silly idea.🙂🙂🙂🙂  is this a new invention?  What are these things called – that I have been using for about 70 years of my life?  Wide at the top, to prevent/reduce spillage, and a spout that fits in the can/bottle/tank that is to be filled, to direct the liquid or powder/granules to where needed.  Big ones, small ones, even tiny ones!

Oh, they <u>are</u> called funnels.  Well I never.  Fancy that.  The simplest idea going.🙂

Years ago we used to use a funnel to get the animals into a line for the likes of ‘dipping’ sheep or ‘drenching’ cattle – even the foot bath for prevention of foot-rot in the sheep.

On 8 September 2024 at 19:57 Bazyle Said:

On 8 September 2024 at 18:13 JasonB Said:

…

…
I guess I learned this at 10yrs old filling the lawnmower but the greenies and townies with no lawns or electric mowers won’t have had such practical life training.

…

Not sure where Bazyle got this notion from.  Drawing the curtains for today’s afternoon nap, I noticed my green townie neighbour showing his lads, eldest 11, how to fill his petrol lawnmower!  Not doing it properly though – neither boy was smoking his obligatory Capstan Full Strength!

At school I remember reading an old chap writing circa 1930 who felt modern youth had lost essential life skills. I was amused by his example – all boys should be taught how to stop a runaway horse in the street! I expect he would have been horrified to find effete boys filling petrol mowers instead of building manly muscles by swinging a scythe…

Dave

On 8 September 2024 at 23:25 duncan webster 1 Said:

In the original post the OP explains why he doesn’t want to use a funnel, so ‘clever’ comments suggesting using one are a bit pointless

OK, but the simple way around knocking over his smaller container is easy enough.  Stand/fix it in something that is far less likely to get knocked over.  Then use a funnel.

Alan –

That is correct but not the full story.

As you pour the liquid out, whatever it is, it has to be replaced by air.

If you try to pour it with the spout at the bottom the two fluids fight each other, causing violent surging with consequent splashing.

Pouring with the spout uppermost allows an air space above the liquid, so the exchange is far smoother.

it also a lot more controllable – you can pour the liquid out in much smaller flow.