What’s this mysterious component in outlet of Freeflow Syphon?

[phil63]

Just replaced an old Armitage shanks Freeflow syphon on a close coupled loo, which included the pictured insert in the outlet pipe. I didn’t think much about it when I replaced the the Freeflow with a Skylo syphon. However, the toilet doesn’t now flush properly, the bowl filling high and emptying slowly; almost like it’s blocked - but nothing has changed, only the swapping of the syphon and removal of the mystery part. Any ideas before i dismantle it again?? Do Skylo syphons have a slow throughput compared to the Freeflow? And does this mystery part have any affect? Thanks in advance.

 

[just pumps]

That is what is known as a bomb. You have one of the best toilet pans ever made. If it was working then put it back.

 

[CBW]

That is what is known as a bomb. You have one of the best toilet pans ever made. If it was working then put it back.

1st I’ve heard of one. Could be limited flush volume?

 

[Exedon]

That part needs replacing make sure the rubber washer washer seals the small hole in pan where it locates,
Double trap symphonic pans don't work without it.

 

[CBW]

That part needs replacing make sure the rubber washer washer seals the small hole in pan where it locates,
Double trap symphonic pans don't work without it.

I wondered if it were a double trap siphonic trap.

 

[Exedon]

Also don't try setting syphon to dual flush needs to be full flush ever time.

 

[phil63]

Brilliant, thanks guys, I’ll try reinstating it, one way or another.

 

[phil63]

In the end I made a replacement diaphragm for the old Armitage Shanks Freeflow syphon, and put it back in, complete with the ‘bomb’.. and it now works better than it has for years! After a little research, it seems the only other option, if the old syphon can’t be repaired, is a Dudley turbo 88 with a Syvac aspirator.. at a hefty £50. Thanks again to Just Pumps and Exedon.