Merc vs sierra trim relay

[spareparts]

use their products all teh time, Have problems with every ones parts sooner or later. BTW, SIerra has a better warranty on their impellers than Merc.You'd be suprised what they will pay for.

[phatdaddy]

thanks spare, i'm going to order the relays today. on the impellers, when i use a merc, my pressure gauge reads 10- 12psi@ 4000+ rpm's, with the sierra 7-9psi. i change my water pump every spring & have noticed this consistently. never had a failure on either brand & have used each several times.
thanks again.