I think you can as long you prove a one year full time job. You need trade certificate which is may be this job might be regulated in some provinces. Check the info below and in the link:
"
Completion of secondary school is usually required.
Completion of a four- to five-year apprenticeship program
or
A combination of over five years of work experience in the trade and some high school, college or industry courses in plumbing is usually required to be eligible for trade certification.
Trade certification is compulsory in Nova Scotia, Prince Edward Island, New Brunswick, Quebec, Ontario, Saskatchewan, Alberta and British Columbia and available, but voluntary, in Newfoundland and Labrador, Manitoba, Nunavut, the Northwest Territories and the Yukon.
Interprovincial trade certification (Red Seal) is available to qualified plumbers."
http://www5.hrsdc.gc.ca/NOC/English/NOC/2006/QuickSearch.aspx?val65=7251