Can a waste cap be unscrewed?

[Neil23]

Can anyone advise - can this type of cap be unscrewed? (one end of a kitchen waste pipe) If so, is there a tool to unscrew or should it be able to be unscrewed by hand?

Similar to the following...

 

[Deleted member 120897]

Yes, generally. Depending on how long it’s been in, it’ll probably needs some pressure from water pump pliers/grips to undo. Careful though, as it could break.

 

[Neil23]

Yes, generally. Depending on how long it’s been in, it’ll probably needs some pressure from water pump pliers/grips to undo. Careful though, as it could break.

Thanks - it has been on there 20+ years... not sure if it is glued on or screwed... difficult access at back of sink unit... I wonder how it could break.... that would be more of a pain..

 

[Deleted member 120897]

I wonder how it could break

Plastic becomes brittle over time.