Union officials say they believe the benefits outweigh what "might be gained by running the risk of rejection"
SIPTU is recommending that its members vote in favour of a new public sector pay deal.
It comes after over 20 organisations reached a deal with the Government in recent weeks on a pay agreement to follow the Lansdowne Road deal.
The benefits to different income groups would range from 6.2% to 7.4% over three years, and would run from 2018 to 2020.
It is expected to be worth around €887m.
SITPU says the agreement - which will serve as an extension of the existing deal - has a number of positive elements.
In a statement this afternoon, the union's executive council said: "Having considered the matter in full, we have decided to recommend acceptance of the proposals, on balance, as the benefits, such as the protections against outsourcing in particular, as well as other positive elements, outweigh the potential for what might be gained by running the risk of rejection.
"In the event of acceptance, we will vigorously pursue implementation of all elements of the proposals. In particular, we will insist on full implementation of Clause 4.1.3. which envisages a process to satisfactorily resolve the issue of pay for new entrants," it adds.
SIPTU members will be balloted from the 3rd of July, with a result expected in August.
Earlier this week, the Association of Garda Sergeants and Inspectors (AGSI) announced it is getting legal advice on the draft deal. The INMO has deferred a decision until its executive council meets again next week.
However, two teachers' unions - the INTO and the TUI - have recommended a rejection of the proposals.