Sorry it took so long. I have them in and they work fine.

Merc sketch

What kind of application (boat/motor) have you installed this part in? How difficult is the install (drilling/tapping)? By how much have you lowered your water pressure?

I have been battling a WP issue in my 32 Fever 502's for some time. Thanks for the post.

Link to Merc Parts Express -http://www.mercurypartsexpress.com/PartsExpress/ProductSelection/ServiceParts/sphome.asp?CID=164151186074230062270

the valves are in 540/500 bulldogs. My pressure gauges were pegged at 35 psi so I really don't know high high the pressure was. Now I max out at 25 psi. I put thru hulls on the side to dump the water.

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offshor,
Thanks for the info. They should have those on the engines stock from merc.

Dan

How much?

Approx $100. each. Merc continued to deny that there was a high pressure problem. They just came out with these about a year ago.....wonder why ?