Elastomuffle rubber exhaust muffle

[SimonA]

I've got a rubber exhaust muffle (called an elastomuffle I think) on my boat, I don't think it is installed correctly as it is pulled down by the exhaust pipe (see image) and I think it should probably be straight, I'm worried if it breaks water can flow in as the exhaust exit is at water level. Is there a modern replacement for these?

 

[Yngmar]

Vetus makes plastic waterlock/muffler units, one of which may fit there. They're not elastic, as that's usually a job for the exhaust hose instead (which they also supply). Sit down before looking up prices.

 

[VicS]

I've got a rubber exhaust muffle (called an elastomuffle I think) on my boat, I don't think it is installed correctly as it is pulled down by the exhaust pipe (see image) and I think it should probably be straight, I'm worried if it breaks water can flow in as the exhaust exit is at water level. Is there a modern replacement for these?

It does not look good.
The boat I used to crew had one but it was mounted vertically , high up under the deck in the swan neck . I always assumed tha was how it should be.
When it blew apart round the middle we just replaced it with a straight piece of hose as the was also a water trap in the system that provided adequate silencing.

If you need the silencing ... you do if there is nothing else... you might look at the range of Vetus rigid.exhaust mufflers

Last time I looked the Elastomuffle was still available but maybe not now. If it is you might consider the vertical mounting I describe if there is space for it

 

[macd]

You don't describe the rest of your exhaust system, but most should have a water trap, which also does the work of a silencer. As well as listing their kit, the Vetus site linked by Yngmar has lots of excellent advice on exhaust design: well worth a good look-see.

If you already have a water trap, I'd be inclined to lob that rubber thing in the skip and replace with good quality exhaust hose. But best practice would be to review your exhaust system as a whole and take it from there.

 

[scottie]

These units were often used as non return valves in the past but experience showed that the slits were not that flexible resulting in water getting back into the system