Sitech P-valve quick-disconnect hose barb diameter?

[RedSeaDiver2]

5/16" fit both the cath side and pee valve side when heated in hot water for a minute or 2.

Indeed - that looks a lot better than the way the black wire-reinforced hose looks on the valve. That valve is 3/8"?

 

[Jhgt2d]

I have to believe the barb side of the valve is 5/16" since it fit well in the 5/16" ID hose. I did not measure it before I put the hose on. If your talking about the condom side of the valve it's about 10.3mm but the condom tubes are latex and easily stretch over the outlet of the valve. In my admittedly limited exposure to condom caths I haven't seen any distinction between sizes on the valve side of things so I assume it's a standard size to fit to the valve.

 

[RedSeaDiver2]

I have to believe the barb side of the valve is 5/16" since it fit well in the 5/16" ID hose. I did not measure it before I put the hose on. If your talking about the condom side of the valve it's about 10.3mm but the condom tubes are latex and easily stretch over the outlet of the valve. In my admittedly limited exposure to condom caths I haven't seen any distinction between sizes on the valve side of things so I assume it's a standard size to fit to the valve.

Cheers! I'm going to give a couple of cath distributors a call tomorrow to find out what size hose barb they recommend for their caths, and to ask them if they think all caths take the same size hose barb. Once I have that information then I should have all of the information about what size hose barbs we need on each end of the quick connect and will know if they need to be the same size (5/16") on both sides of the quick disconnect, - or whether we need a quick disconnect that has a 5/16th barb on one side to match the hose so as we avoid the silly situation of trying to force a 5/16th hose on to a 3/8" barb, and a 3/8" barb on the "top" end to match what the catheter requires. With a quick disconnect it is actually quite easy to order one with different sized ends if buying in a small quantity. I can see a youtube video coming up explaining all of this once we get it nailed down.

 

[RedSeaDiver2]

OK - spoke to two suppliers of different catheters and both said that all brands have the same size tip on the external catheter - but they didn't actually know what the size was! But from all accounts on here the tips of the catheters take a 3/8" hose barb - and I'm pretty certain that a 5/16" hose barb would be too small and leak.

So here is now what we know starting from the bottom - as we can't change the size of the hose barb on the actual pee valve

- the Sitech Trigon Pee Valve has a 5/16" brass hose barb...
- therefore the Norprene / Tygon hose (or any other hose you may choose) must be 5/16" I.D. - a 3/8" hose will be too lose on the hose barb and will leak
- therefore because the hose is 5/16" it is logical that the hose (bottom or downstream) end of a quick disconnect or on/off valve should be 5/16" too - however I will need to do some testing to see if a 3/8" hose barb will fit the norprene tubing - the 5/16" norprene tubing may stretch enough to take a 3/8" valve... but it may not... - and it probably depends on which make and model of norprene tubing you have too... but it may be safer to get a quick disconnect that has a 5/16" hose barb on the bottom end as logically that should fit 5/16" hose perfectly well
- we now are reasonably confident that the catheter (top or upstream) end of the quick disconnect needs to have a 3/8" hose barb.

So the logical thing now is to find a quick disconnect that has a 3/8" hose barb on the male (upper) end of the quick disconnect, and a 5/16" hose barb on the female (lower) end of the quick disconnect. Does anyone disagree?

 

[Boarderguy]

You're putting a lot of work into this... just get a set of 3/8" dry break (female), open (male) quick disconnects from McMaster Carr. Use a hair dryer to warm up the tube and press it onto the barb. The valve itself is already connected to the hose. You might be able to order a female 5/16 tube ID with 1/4 coupling if you really want to go that route.

 

[RedSeaDiver2]

You're putting a lot of work into this... just get a set of 3/8" dry break (female), open (male) quick disconnects from McMaster Carr. Use a hair dryer to warm up the tube and press it onto the barb. The valve itself is already connected to the hose. You might be able to order a female 5/16 tube ID with 1/4 coupling if you really want to go that route.

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Yes - but McMaster-Carr don't ship to Australia - and we don't have an equivalent of them down here. It's not just understanding the quick disconnect sizes but also the hose size - because as you have previously found - the black spiral wire reinforced hose is not fit for purpose - for several reasons, and so I am going to fix all of the problems that Sitech have engineered into their product. I come from a background in subsea engineering - we fix all the problems that get sent to us before we put anything in the water - it makes for a much less stressful life. I think I've found a place where I can obtain a quick disconnect that has a 5/16" barb on the female and a 3/8" barb on the male part of the quick disconnect - so then everything will all match the size that they are connecting to.

For those wondering about Tygon tubing - this one from McMaster-Carr seems to have the best properties for the job including wall thickness, minimum bend radius etc - 5/16" I.D. with 3/32" wall thickness McMaster-Carr - for those like me that can't get McMaster-Carr products delivered to them - this tubing is Saint Gobain Tygon A-60-G https://www.ics.saint-gobain.com/pr...oplastic-elastomer-flexible-tubing/tygon-60-g

 

[Boarderguy]

Yes - but McMaster-Carr don't ship to Australia - and we don't have an equivalent of them down here. It's not just understanding the quick disconnect sizes but also the hose size - because as you have previously found - the black spiral wire reinforced hose is not fit for purpose - for several reasons, and so I am going to fix all of the problems that Sitech have engineered into their product. I come from a background in subsea engineering - we fix all the problems that get sent to us before we put anything in the water - it makes for a much less stressful life. I think I've found a place where I can obtain a quick disconnect that has a 5/16" barb on the female and a 3/8" barb on the male part of the quick disconnect - so then everything will all match the size that they are connecting to.

For those wondering about Tygon tubing - this one from McMaster-Carr seems to have the best properties for the job including wall thickness, minimum bend radius etc - 5/16" I.D. with 3/32" wall thickness McMaster-Carr - for those like me that can't get McMaster-Carr products delivered to them - this tubing is Saint Gobain Tygon A-60-G https://www.ics.saint-gobain.com/pr...oplastic-elastomer-flexible-tubing/tygon-60-g

To be fair I think I'm the only one that's experienced this failure of the trigon hose. It's a good design, but if it's stressed enough the coil can fail like mine did. It probably has to do with the lack of care and the occasional hard 90° bend the hose got in my suit during storage and when donning.

Since McMaster Carr doesn't ship down there you have a few options. Find a local source that provides a dry break female and open male, or have someone stateside order it and send it down under.

 

[RedSeaDiver2]

To be fair I think I'm the only one that's experienced this failure of the trigon hose. It's a good design, but if it's stressed enough the coil can fail like mine did. It probably has to do with the lack of care and the occasional hard 90° bend the hose got in my suit during storage and when donning.

Since McMaster Carr doesn't ship down there you have a few options. Find a local source that provides a dry break female and open male, or have someone stateside order it and send it down under.

I will be in China at the end of the month - there is a factory there that makes a double o-ring version and they are happy to sell me a 5/16" female with a 3/8" male - for $0.38