Who makes the best aftermarket flush kit?

Thanks!

Guardian

I do.
No springs or moving parts to stick obstructing flow, no plastic parts to break, or valves to remember to open or close.

1) unscrew cap
2) fasten garden hose
3) turn on hose
4) start motor
5) drink beer while it flushes
6) stop motor
7) unscrew hose
8) reinstall cap.

done.
Flushes drive and motor.

Superflush

Right on, this is the best setup. Hardin marine makes the T-fitting for $40. Perko makes the hose connector. Use 3/4" reinforced hose with a ball valve on it to close off when you are not flushing. Works awesome, I can't believe I didn't do it years ago.

The Guardian is nice because you dont have to run the engine.


http://www.mstguardian.com/Guard%20ADV1.htm

thanks

What is the cost of the Guardian system for I/O?

I believe it costs about $450.00 per engine. It reverse flushes the block from the bottom, which is the hot set-up.

I thought that MST guardian went out of business a couple of years ago ?
A similar product is Superflush: http://superflushsystems.com/
I am using it myself and I am very happy with it.