Sitech P-valve quick-disconnect hose barb diameter?

[RedSeaDiver2]

No probs. Once you get it, it might be an idea to report back here as to whether the LM hose works as a replacement for the Sitech valve. Could help others in the future.

Yes indeed - will do!

 

[lexvil]

For the record I have used trigon valves for about 10 years and never had an issue with the hose so don’t go off half cocked thinking it’s going to fail, don’t sweat the bulge from the disconnect

This one is my oldest one, si-tech sent a replacement as an upgrade for the old type balance diaphragm you see, it was the only flaw in the design in that the exposed mushroom valve could be disrupted by rinsing with to much pressure (if you have one like this on an older suit, anyone, contact Si-tech and they will send a replacement) I can only assume Border guy damaged his in one of his legendary “over familiarity” situations with his DPV, although I would have been less surprised if propane Rob had done it since I hear he dives with one hand inside his suit to “comfort” himself

 

[Kahuna.]

Yeah, I don’t think you are meant to clip your DPV off to your tinkle valve.

 

[RedSeaDiver2]

Yeah, I don’t think you are meant to clip your DPV off to your tinkle valve.

Probably not!

I'm still not impressed with that wire-reinforced hose that Sitech supply, and given that they supply a on/off valve instead of a quick disconnect it makes sense to replace all the bits that I think need replacing all at once.

Hopefully @Pat S can measure the diameter of the hose barb on the actual P valve for me and then I will get everything ordered - along with a ton of extras.

 

[lexvil]

Keep the old one, when your replacement kinks or crushes and you blow the catheter off from back pressure you may want to use it again. It’s not wire wrapped it’s a nylon or something spiral that is coated with whatever. You can order quick connects from Seaskin, I use the simple kind without any check valves, others prefer check valves, you don’t want Seaskin make that decision for you

Pee Valve Quick Connect (Female Barb 9.3mm) - Seaskin Drysuits Shop - Purchase Drysuit Supplies

The Pee Valve Quick Connect makes coupling and un-coupling your condom/she pee to your pee valve system easier and more secure. The male side of the Purchase Pee Valve Quick Connect (Female Barb 9.3mm) from Seaskin - drysuit supplies made to order directly from the factory.

seaskin.co.uk

 

[Jhgt2d]

I just replaced my sitech pee valve hose with 5/16" ID clear vinyl hose. Cut a generous portion to loop from pee valve up to waist band and over to my junk and it's been great for the last 3 dives.

I added 2 small zip ties to the pee valve size to ensure it doesn't slip off, but from the amount of force and heat required, there's little chance of that. I soaked the hose ends in hot water for 5 minutes before slipping it on both ends.

 

[Jhgt2d]

Would one of you mind measuring the external diameter of the (brass?) hose barb that is on the P-valve itself? Seems like the way to go is to firstly replace the wire-reinforced hose that Sitech provides as it both cracks (leaks) and also the ends look pretty dodgy to me when the hose barbs of the quick disconnect are inserted into it - expands the hose too much. Because it is so hard to get stuff in Australia I will get a roll of norprene tubing and also a heap of quick disconnects - seeing as Sitech are selling them with horrible hose and an on/off valve instead of a quick disconnect.

I guess to answer your specific question, I measured in-between the barbs as 0.31" or 7.9mm with my calipers. The 5/16" fit well after softening the ends with hot water.

 

[RedSeaDiver2]

I guess to answer your specific question, I measured in-between the barbs as 0.31" or 7.9mm with my calipers. The 5/16" fit well after softening the ends with hot water.

Cheers - and 5/16" hose makes sense as 5/16" is 7.94mm - and I would describe the barbs on the brass hose barb as being a fairly aggressive profile.

So working through the problem in reverse from the Pee valve end (as we can't change the size of the brass hose barb that is fitted to that) - this is what we know so far -

- at the Sitech Pee valve end we need 5/16th hose to go on to the brass hose barb.

- therefore at the hose end of the white plastic quick disconnect we need a 5/16" hose barb as well (because the hose obviously has to be 5/16" or else it won't fit the hose barb at the Pee valve) - and because a 5/16" (7.94mm) I.D. hose probably isn't going like being stretched to take a 3/8" (9.53mm) hose barb - which is probably the reason that the Sitech wire reinforced hose looks far too stretched on the barb of the white plastic on/off valve that they supply - the Sitech hose is almost certainly going to be a 5/16" hose as it needs to fit the brass hose barb on their pee valve - a 3/8th hose would be far too large and wouldn't seal on the brass hose barb.

So the question now is - what diameter hose barb is needed to fit the catheter end? Do all catheters have the same diameter tip and take the same diameter hose barb? @Boarderguy mentioned in the third post right at the start of this thread that a 5/16" hose barb wasn't the right size to fit the catheter and so for whatever brand of catheter he uses it seems like a 3/8" tip is what is needed - on that size of the white plastic quick disconnect. This probably explains why Sitech supply a 3/8" on/off valve even though the hose they supply is a 5/16" hose to fit the brass hose barb on the actual pee valve.

To put things another way - does anyone have catheters that require a hose barb of any different size to 3/8" ?

And seeing as we might as well solve all the world's problems while we are at it - ladies - what size hose barb is needed for the She-P ?

The other thing that I am now working through is the tubing - after doing a bit of research it turns out that "Norprene" isn't a type of tubing but rather the term Norprene covers a wide range of tubing that has various different uses - and properties - including ones that are important for our particular end use such as bend radius and resistance to kinks. I'm working through that now to determine which is the best "Norprene" tubing for our application.