Occy freeflowing when gently submerged

[JeemyT]

Hi all,
I'm experiencing a problem where my occy - facing upwards and inside a rubber bell holder - goes into freeflow as soon it submerges into water, even very gently. I can only stop it by facing it downwards and very very slowly rotating it back up. It doesn't freeflow once underwater. It was serviced only recently, including diaphragm replacement. The purge has been adjusted to be less sensitive also. Are there any obvious problems I'm missing? Is finding a holder that faces the occy downwards my only solution? Model is Apeks XTX50
Cheers.

 

[lowwall]

Get rid of that bubble mouthpiece holder pronto. Just coil a loop and stick it through a D-ring or even consider a fishermans release knot and a bungee necklace. That mouthpiece holder prevents the second stage from flooding out and are bad about causing free flows.

Or a silicone snorkel keeper. Go to 2:29 in this video. Silicone is better than rubber.