SQL list all unique GT1.3 values in suspended messages

I'm close with this but I'm not sure how to grab JUST the GT1.3 data.  I know I can do a substring but finding the 3rd | is a tad tricky.  I've not been this deep in SQL for 15 years.

SELECT SUBSTRING(hm.RawContent, (CHARINDEX('GT1',hm.RawContent)), 50) as NameDesc
FROM Ens.MessageHeader as em, EnsLib_HL7.Message as hm
where em.Status = 'Suspended'
and em.MessageBodyId = hm.id

I expect it should flow like this...

SELECT UNIQUE SUBSTRING(RawContent, (FIND 3RD PIPE),(FIND 4TH PIPE) as NameDesc ....