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Jim Kaekel · 12-23-2009, 12:36 PM

Yes, the TH-350 is 1/4" NPT, as is the TH-400. I think all NPT to AN adapters made by Aeroquip, Earls, etc. are tapered NPT, rather than the OEM which is not tapered and uses a sealing washer. You can definitely crack the case if one of these type of adapters is over tightened due to the fact it is tapered.

12-23-2009, 12:36 PM	#5
Jim Kaekel VIP Member Join Date: Jul 2002 Location: Michigan Posts: 1,229 Likes: 133 Liked 535 Times in 110 Posts	Re: TH350 Cooling Line Fittings Yes, the TH-350 is 1/4" NPT, as is the TH-400. I think all NPT to AN adapters made by Aeroquip, Earls, etc. are tapered NPT, rather than the OEM which is not tapered and uses a sealing washer. You can definitely crack the case if one of these type of adapters is over tightened due to the fact it is tapered. __________________ Jim Kaekel 3836 STK