I while back I fitted at vacuum toilet and brought what I thought was the correct (best) sanitary hose. Well, it was made of the right material, but the inside of it had a raised spiral ridge just like the outside. I used a hot air blowers to soften the hose before applying double hose clamps (pre-greased) everywhere.

The vacuum pump was able to pull a vacuum, but it always leaked and the vacuum pump would cycle about every 15minutes. Over the years I continued to nip up the hose clamps but the leaking problem never really improved.

Recently I saw that Road Tech Marine had a similar sanitary hose to what I had used, but the internal ridges was very minimal. So I bit the bullet, brought some of the hose and fitted it (hot air and double hose clamps) and no more leaks.

Leaks = No juice ever came out, but air was entering the chamber,

Another Learning$$ curve. Maybe everyone one was aware of this issue with the different sanitary hose internal ribbing heights, but hopefully someone may benefit from my experience.

Hoses definitely ain't hoses!!!

I work for a large Tassie hose supplier and we supply an Italian made sanitary hose. The chinese stuff some of the big chandleries stock is exactly as you said and also causes weak spots and the hoses cam crack after less than a year.

I have had two customers who put the 19mm on their toilet inlets only to have to fail. Fortunately they were on the boat at the time and they were able to shut the seacock off before the boat sunk!!

On the subject of hoses, often one sees anti siphon loops on suction hoses for marine heads and engines. To my mind this defeats the purpose as the bleeder valve will allow air to be drawn into the line.

Any thoughts on that???

Jolene said..
,, or maybe the seacock for the head is shared with other applications so the seacock is required to be left open.

I am using a Jabsco Vented Loop Solenoid on each vented loop for each head.
www.whitworths.com.au/jabsco-vented-loop-solenoid

"The extra suction generated by Jabsco electric toilets will open the valve in vented loops, drawing in air and preventing priming. The Solenoid Valve attaches directly to Jabsco Vented Loops and is wired to the toilets on/off switch."


The raw water intake for the heads is also used for deck wash & raw water tap at the sink etc.

Works for me!!