mike2016 Posted June 18, 2019 Share Posted June 18, 2019 Hi, I'm trying to figure out how to connect up a Conway BA13 washlet. The T connector they provided doesn't fit the flexible connector I have going into the cistern feed. I tried a few local plumbing suppliers but they didn't come up with anything other than compression fittings. I was hoping for something similar to the supplied t piece adapter I could just screw in myself. The flex hose connects via 3/4" screw in via a BSP thread - the washlet t piece top and bottom ends shown below are only 5/8" / 15mm though. I don't want to replace the flexihose as it has a valve in it, otherwise I'll have to drain the system....I could get some reducers to add to the t-piece? Thanks! Link to comment Share on other sites More sharing options...
Carrerahill Posted June 18, 2019 Share Posted June 18, 2019 (edited) 44 minutes ago, mike2016 said: Hi, I'm trying to figure out how to connect up a Conway BA13 washlet. The T connector they provided doesn't fit the flexible connector I have going into the cistern feed. I tried a few local plumbing suppliers but they didn't come up with anything other than compression fittings. I was hoping for something similar to the supplied t piece adapter I could just screw in myself. The flex hose connects via 3/4" screw in via a BSP thread - the washlet t piece top and bottom ends shown below are only 5/8" / 15mm though. I don't want to replace the flexihose as it has a valve in it, otherwise I'll have to drain the system....I could get some reducers to add to the t-piece? Thanks! I'd get a 3/4 male Tee and a 3/4 coupler/socket, that lets you basically screw a T onto the underside of the cistern, then screw your 3/4 flexi onto it, then get a 3/4 to 1/2 reducer (I am not sure it's 5/8, 1/2 would be more common). https://www.toolstation.com/brass-female-socket/p43908 https://plumbing4home.com/brass-t-shape-water-fuel-pipe-male-tee-adapter-connector-34-inch-thread/ https://www.malcleanse.co.uk/34-bsp-f-x-12-m-brass-reducing-nipple-176921-p-7133.html Edited June 18, 2019 by Carrerahill Link to comment Share on other sites More sharing options...
mike2016 Posted June 18, 2019 Author Share Posted June 18, 2019 Thanks! Order on the way!! Link to comment Share on other sites More sharing options...
mike2016 Posted June 24, 2019 Author Share Posted June 24, 2019 Hmmm... Now it say's 3/4 inch thread on the invoice, it's marked 3/4 but the measuring tape says different. Did I get the wrong part or order the wrong thing?! Link to comment Share on other sites More sharing options...
SteamyTea Posted June 24, 2019 Share Posted June 24, 2019 Isn't 3/4 the bore of the pipe. I have never really understood plumbing fittings. Link to comment Share on other sites More sharing options...
Gone West Posted June 25, 2019 Share Posted June 25, 2019 The table below shows dimensions for male threads and the number of threads per inch (TPI) : British Standard Pipe Thread Sizes BSP Size Outside Diameter TPI 1/16" 7.7mm / 0.304" 28 1/8" 9.7mm / 0.383" 28 1/4" 13.16mm / 0.518" 19 3/8" 16.66mm / 0.656" 19 1/2" 20.99mm / 0.825" 14 5/8" 22.99mm / 0.902" 14 3/4" 26.44mm / 1.041" 14 1" 33.25mm / 1.309" 11 1-1/4" 41.91mm / 1.650" 11 1-1/2" 47.80mm / 1.882" 11 2" 59.61mm / 2.347" 11 2-1/2" 75.18mm / 2.96" 11 3" 87.88mm / 3.46" 11 4" 113.03mm / 4.45" 11 5" 138.43mm / 5.45" 11 6" 163.83mm / 6.45" 11 1 Link to comment Share on other sites More sharing options...
ProDave Posted June 25, 2019 Share Posted June 25, 2019 13 hours ago, mike2016 said: Hmmm... Now it say's 3/4 inch thread on the invoice, it's marked 3/4 but the measuring tape says different. Did I get the wrong part or order the wrong thing?! Does it fit? That is the only important question. 1 Link to comment Share on other sites More sharing options...
Carrerahill Posted June 25, 2019 Share Posted June 25, 2019 (edited) 13 hours ago, mike2016 said: Hmmm... Now it say's 3/4 inch thread on the invoice, it's marked 3/4 but the measuring tape says different. Did I get the wrong part or order the wrong thing?! You are measuring the thread of a union all the measurements are based on the pipe size. Take a 15mm compression joint, it's bigger than the 15mm pipe itself but it's still a 15mm joint. Your tape is a little off at the left but a 3/4inch BSP thread will be 1.041". Edited June 25, 2019 by Carrerahill Link to comment Share on other sites More sharing options...
Ed Davies Posted June 25, 2019 Share Posted June 25, 2019 12 hours ago, SteamyTea said: Isn't 3/4 the bore of the pipe. I have never really understood plumbing fittings. My understanding: inches are the inside diameter (bore), mm are the outside diameter. E.g., ½" = 15mm. (15 - 12.7)/2 = 1.15mm wall thickness. Is that broadly right? No doubt there are weird exceptions. Link to comment Share on other sites More sharing options...
SteamyTea Posted June 25, 2019 Share Posted June 25, 2019 is 15 mm about 5/8th of an inch, which is probably a 1/2" pipe. Who thought up this system, a Victorian. Link to comment Share on other sites More sharing options...
mike2016 Posted June 25, 2019 Author Share Posted June 25, 2019 Thanks - looks like I should've asked for a 1/2" BSP size. Lesson learnt!! Inside diameter it is...!! Link to comment Share on other sites More sharing options...
mike2016 Posted July 23, 2019 Author Share Posted July 23, 2019 Well, I got the parts and put them together. Washlet working but I've a persistent leak. I've circled where it appears to originate from in the photo below. I've tried Fernox a few times and just can't shake it. My suspicion is that the piece labelled A is just a straight through screw piece to join the toilet cistern thread to the t-piece thread. There's nothing inside like a washer to press up against. The area I've circled just weeps constantly. My question is how do I seal this connection - the hose ends all have a washer and tighten up but the coupling A I've never faced before and apart from PTFE tape I've no idea what else to do there to make a good seal.....?!! Thanks! Link to comment Share on other sites More sharing options...
Carrerahill Posted July 23, 2019 Share Posted July 23, 2019 (edited) 7 minutes ago, mike2016 said: Well, I got the parts and put them together. Washlet working but I've a persistent leak. I've circled where it appears to originate from in the photo below. I've tried Fernox a few times and just can't shake it. My suspicion is that the piece labelled A is just a straight through screw piece to join the toilet cistern thread to the t-piece thread. There's nothing inside like a washer to press up against. The area I've circled just weeps constantly. My question is how do I seal this connection - the hose ends all have a washer and tighten up but the coupling A I've never faced before and apart from PTFE tape I've no idea what else to do there to make a good seal.....?!! Thanks! Normal for threaded unions like this not to have any seals or gaskets, when jointing iron pipe with threaded ends onto malleable iron fittings it was common to use water hawk or white hawk for gas. Those lines then last for ever. Get it stripped, dried and get a good dose of Water Hawk on it, do it up and leave it to set up a bit, it says instant and if it doesn't leak then it's good for ever but I tend to give it an hour or so. It will seal. Out of a matter of interest, how many wraps of PTFE did you use? It is common to need to use a good 15-20 on larger threads. Edited July 23, 2019 by Carrerahill Link to comment Share on other sites More sharing options...
mike2016 Posted July 23, 2019 Author Share Posted July 23, 2019 Thanks! I take it you use water hawk OR PTFE, not both? I did about a dozen wraps of PTFE, I'll clean it all up and try that jointing compound next.....Cheers..! Link to comment Share on other sites More sharing options...
Carrerahill Posted July 23, 2019 Share Posted July 23, 2019 (edited) 2 minutes ago, mike2016 said: Thanks! I take it you use water hawk OR PTFE, not both? I did about a dozen wraps of PTFE, I'll clean it all up and try that jointing compound next.....Cheers..! Correct just a single product. For a cheaper alternative and so you don't have a tin of stuff you may never use again you could try LSX. If you only did 12 wraps of PTFE I would go for 20 and try again. It should seal with PTFE. If you stage it so you can get it threaded then it gets thicker on the tape it will bind up well, it should be a fair twist once you get going, if it spins on easily with fingers after the first few threads then you didn't use enough. Edited July 23, 2019 by Carrerahill Link to comment Share on other sites More sharing options...
mike2016 Posted July 23, 2019 Author Share Posted July 23, 2019 It was LSX I was using but to seal it all up after the fact, rather than on the threads itself. I'll check out the price and see which way to go, good option though thanks! Link to comment Share on other sites More sharing options...
Jeremy Harris Posted July 23, 2019 Share Posted July 23, 2019 Also, make sure you pull the PTFE tape tight into the threads when wrapping it, and wrap it so it tightens as the parts are screwed together. As above, fairly usual to need 20 wraps or more of PTFE tape pulled tight on fittings like this. I'm also a fan of the Screwfix Liquid PTFE. Stupidly designed bottle it comes in, but I've yet to find a fitting it can't seal up first go. Link to comment Share on other sites More sharing options...
ProDave Posted July 23, 2019 Share Posted July 23, 2019 If I get a leak I use my tub of Water Hawk Potable Water Jointing Compound. That pot was my dad's and must be nearly as old as me. Link to comment Share on other sites More sharing options...
mike2016 Posted July 23, 2019 Author Share Posted July 23, 2019 Right! Off to find some Water Hawk and give it a try!! Thanks for all the advice & tips!! Link to comment Share on other sites More sharing options...
ProDave Posted July 23, 2019 Share Posted July 23, 2019 Here you go https://www.ebay.co.uk/itm/400-GRAM-FERNOX-WATER-HAWK-POTABLE-WATER-JOINTING-COMPOUND/291969968978?epid=533104274&hash=item43fac42b52:g:rWsAAOSw-K9ZI0gL Link to comment Share on other sites More sharing options...
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