Freshwater flush

Is it feasable to install the flush tube on an older model 2 stroke 150 Yamaha. The boats in the slip and would love to easily flush them out. Currently using the muffs underwater, works but only so so. Any ideas?. Thanks.

GW 232GT Gulfstream
150Yam x 2
“3rd Day”
Gen. Chap.1 Vs.9-13

I have a buddy that is a crabber. He has a Carolina Skiff that he bought at the same time I bought mine. He always asks me “how many hours you got on that motor”. Last time I had 400 hours. He said he has 3000 hours on his!!! He said he had another crabber friend that ran his motor for 7000 hours and never flushed it. I think the most important thing is to run the engine frequently rather than stress over the flush aspect. The thing I always say is “running that motor is the best maintenance”.

Dorado II
Carolina Skiff 25DLV