How to remove the snap ring off this isolation valve of my shower?

[LilyT]

Hi there, I have a Grohe shower valve like in the attached picture. I'd like to replace the isolation valves or stop valves because one is leaky, part# 47051000. The valve is a cylinder shape secured by a snap ring.
Unfortunately, I couldn't remove the old snap ring. I bought Pittsburgh Snap Ring Pliers from Harbor Freight store. I was able to use the pliers to squeeze/close the snap ring, but when I tried to pull it out, it slipped, I lost the grip of the snap ring, and the snap ring sprang back to the old position.
I have also attached a closed-up shot of the old isolation valve and a picture of my new valve & snap ring.
Do you know any tricks to take off the old snap ring?
Thank you!

 

[Twowaxhack]

Use a pair of needle nose pliers to grab the ring when you squeeze it with the snap ring pliers

 

[LilyT]

Thanks for the reply!
There is no space to fit two pliers in the wall opening. I tried the hook that the dental hygienist uses, but I couldn't even get the hook in there behind/under the snap ring. The needle nose pliers has much bigger tips than the dental hook, could be even harder to fit in there.

 

[Twowaxhack]

You might need to get snap pliers that fit the snap ring better. Maybe a quality set.

 

[havasu]

I agree. Snap ring pliers are what you need. Nothing else will work properly.

 

[Jeff Handy]

Yes, better quality pliers and more patience and practice.
If you are rushed or jittery or angry, forget it.
Take your time, have a drink or some deep breathing first, it is frustrating but there is no hurry.
Keep that in mind, proceed as though you are defusing a bomb, so be careful, accurate, and slow.

 

[havasu]

A bit more on the snap ring pliers, unless you find a need to use them often, a nice set with adjustable internal/external settings work great, and won't break the bank.

 

[Twowaxhack]

I like these

https://www.lowes.com/pd/CHANNELLOC...EciYovnLwf0xVt0cj1AaAl1VEALw_wcB&gclsrc=aw.ds

 

[havasu]

I really like that. Just flip the switch from internal to external. Looks like my next purchase.