here are the only 4 dual products I have been able to find that are specific to the marine industry. Actually they are pretty much the only vendors I can find even in non marine applications.
Griffin GTB228DM-MA dual filter/water seperator http://www.griffinfilter.com/s…..INE+SERIES you can purchase from http://www.filtrationdepotonline.com
Racor RAC75500DMx2 dual filter water seperator http://www.parker.com/portal/s…..&Wtky= you can purchase from http://www.jamestowndistributo…..o?pid=6432
Separ Filter SWK-2000/5 & /5U dual filter water seperator http://www.separfilter.com/ind…..separ5.php call the number on the website
Filter boss system that uses racor filters http://www.ktisystems.com/cate…..y-s/25.htm
my criteria has been cheap replaceable filters, vacume gauge and a simple on lever ability to switch between filters.
Separ and Racor seem to be supported products. I got someone on the phone at both companies quickly who was helpful. Griffin is a chinees company and the only US distributer that I can find is hard to communicate with. They only have email on their website. Though when emailed they did send me a phone number. However the phone number goes to an anonymous voicemail and I haven’t gotten a call back yet. Griffin filter unit is a knock off of the racor one and can use standard racor 2010 filters.
Separ price is about $1300
Racor prices is about $800
Griffin price is about $500 actually i am guestimating as the same product in the non marine version.. no heat sheild under the unit is $455
Kti with the filterboss is a deluxe system with built in electronic fuel pump but is pricey in the $1400 range.
I’m going into sticker shock..
I think I will just get a couple 3 way ball valves and make my own with a couple used racor marine filters. under 300 for the whole setup. well after you throw in the extra fittings and misc this and that.. probably 400.. but still..just wow…
I ordered the filters yesterday and they should be in by tuesday. Hopefully I will get to install them in the next couple weeks. Here is where I got them. I called them and got two of these for $200 and 6 spare filters for an extra $50. So far that puts me at $250 on this project. I still have to purchase some fittings and 3 way valves.
http://filtrationdepotonline.c…..racor.html
I plan on installing these on the starboard side of the engine compartment up front and over the engine. The wood lip at the opening on either side is 2 inchs wide so by installing these aft of that lip that the stairs rest on they shouldn’t extend to far into the opening to get in the way. They are supposed to be 4.8 inches deep when mounted. That will put 2.8 inches of them extending past that lip. However I expect to get about 4 to 6 inches back on the other side of the opening when I move the coolant overflow tank from there to somewhere away from the entrance.
Hopefully one day I will have some pictures to go with this 
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