No the snap ring holds the bearing in not the seal. Nothing holds the seal in but the intererence fit in the T-Box. One thing you should look at, make sure it is the seal that is leaking. There is an o ring on each side of the T-Box where the pumps bolt on. Over time the heating cooling and expansion and contraction can cause the o ring to shrink and cause them to leak. They are part no. 4421221 takes two.