do you have pics of what you're working with? Hoses from the pump to the firewall would be heater hoses. The LS pumps have pressed in nipple fittings on the pumps. I remove those and tap them for pipe threads (one is 1/2" NPT and the other is 3/8" NPT). Then I can use a pipe to #10 AN fitting and run my #10 heater hoses to the firewall. I'm confused by the 0-ring fitting you mentioned, all the firewall bulkhead heater hose fittings I've used have had normal male AN ends on them, so any #10 AN hose end would work. The A/C fittings are 0-ring #6 and #10 (others sizes optional) but not the water fittings.
Jody
Last edited by camcojb; 05-12-2010 at 12:29 PM.
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