Oxy/acetylene parts questions

[Bonnewagon]

I need to replace my acetylene torch twin hoses so I figured I would replace the flashback arrestors/check valves at the same time. My old Sears torch was made by Harris and I have been happy with the Harris replacement parts. I only see the Harris 88-5FBR and 88-5FBT arrestors available. I know R is regulator mount and T is torch mount. Does anyone know what the 88-5 numbers indicate? The threads are the 'B' 9/16-18 which is what my torch uses. The hoses that came with the Sears torch are 3/16". Most replacements I see are 1/4", while 3/16" are harder to find. Is using 1/4" a problem? The originals are R rated for acetylene only. T rated are for acetylene and all other gasses but more importantly, T rated hoses are flame and oil resistant. That seems a better choice just for safety. What do you think?

 

[Bonnewagon]

Well, it doesn't matter much because these are all that is available. There are only CS, check valves, and BF, backflash arrestors available. Then there are A, B, and C type fittings, B being the most common. I learned that the larger ones are for very high volume and have a thermal shut off incorporated. That is in case of a sustained flashback. I also learned that having one cylinder very low on gas can be overcome by the higher pressure tank and cause back- mixing, and a flashback. 40 years playing with fire and I am still learning. I ordered the Harris flashback arrestors, which have check valves built in, and I will use both the torch and regulator mounted types. Yeah, I am a belt-and-braces kind of guy. As for the hose, lots of options, most are imported crap. The reviews are horrible with cracking and bursting a common complaint. I did manage to find some Anchor/Best Welds Made-In-USA hose that uses Continental hose. I got a great price at an industrial supplier in Illinois. I opted for the T rated type for the fire/oil resistance factor. I also found out that my Sears torch made by Harris is still in production, it is that good. I see NOS Sears units on Fleabay but why bother when brand new stuff is available? So as soon as these things arrive I will be back in business.