Tank Threads.....

[shipreq]

I am looking for a cheap method of holding my tank valve for disassembly/assembly. I have been trying to find a 3/4" x 14 pipe pipe nipple. I would use this to hold my valve in a vise. Thx Shipreq

 

[pescador775]

I'm not sure why you are having trouble with finding this but even so, a pipe coupling would use a tapered thread whereas the SCUBA valve is NPS, straight. Just hold the valve in a smooth jawed vice or insert it in a tank while wrenching.

 

[shipreq]

Thank you. I did end up using the tank but was just looking for a jig to put in the vise. I understand this is a straight pipe thread. I would guess that an electrical conduit coupling would work since these are a straight thread also.

Thanks again.

 

[WD8CDH]

An aluminum electrical conduit coupling would be even better since it would be softer than the valve.

 

[pescador775]

My information is that steel conduit thread uses a taper of 3/4 inch per foot.

 

[WD8CDH]

The conduit pipe thread is usually tapered but the coupling thread is usually straight.

 

[shipreq]

Thanks to all those who read my note and replied. I tried an electrical "coupling" and it worked great! I think I was trying to make it harder that it actually was since I was under the impression scuba gear always has to be a "little bit different". Note: a pipe coupling will not work as it is designed to "seal" whereas a straight thread is done for mechanical integrity and the seal actually comes from the o-ring.