Help with Bernard parts

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I have a Bernard Q300 gun, and I want to put a tapered tip and nozzle on it to get into some tighter spots.  I was just looking at Bernard's parts catalog and they show "Small Centerfire Gas Diffusers and Nozzles" and "Large Centerfire Gas Diffusers and Nozzles".Which group do I need to look at?  I think want to get the 3/8" ID setup. Thanks for any wisdom!
Reply:I have those but they are in LA still so can't go out and look.  See this link. Their should be a marking on the diffuser on your gun. D-1 or DS-1 then just order the matching consumables.use the pic to tell which diffuser you have if no markings it's an accurate illustrationhttp://www.bernardwelds.com/centerfi...0#.VDeKRGFydPELast edited by soutthpaw; 10-10-2014 at 03:28 AM.Tiger Sales:  AHP Distributor    www.tigersalesco.comAHP200x; AHP 160ST; MM350P,  Spoolmatic 30A; Everlast PowerTig 185; Thermal Dynamics 60i plasma.  For Sale:  Cobra Mig 250 w/ Push-pull gun.  Lincoln Wirematic 250
Reply:Great! Thanks.   I'll look for that number first thing tomorrow.
Reply:Ok, I can't read any numbers on the diffuser because someone has been using pliers instead of a wrench to remove it  but from the image it is going to be the large style.  Now I need to decide if I want to get the cone for this one, or convert it to the small style and go from there.  Thanks for your help!
Reply:i have ordered all mine via Weldingsupply.com as they were the cheapest and had all i needed. just enter the bernard part number in the search box.Tiger Sales:  AHP Distributor    www.tigersalesco.comAHP200x; AHP 160ST; MM350P,  Spoolmatic 30A; Everlast PowerTig 185; Thermal Dynamics 60i plasma.  For Sale:  Cobra Mig 250 w/ Push-pull gun.  Lincoln Wirematic 250
Reply:Funny, after searching I found they had the best price!   Thanks again.