epsilonGreedy Posted December 9, 2018 Share Posted December 9, 2018 Is it possible to buy a 110mm valve that operates as an air expulsion valve? I ask because looking at the mechanism of the the AAV I purchased on friday it appears the close under negative drain pressure. Link to comment Share on other sites More sharing options...
PeterW Posted December 9, 2018 Share Posted December 9, 2018 Nope - May look that way but the diaphragm moves down to allow air into the pipe. Link to comment Share on other sites More sharing options...
ProDave Posted December 10, 2018 Share Posted December 10, 2018 If you had one that opened on positive pressure it would let all the stink into the house and might as well not be there. Link to comment Share on other sites More sharing options...
epsilonGreedy Posted December 10, 2018 Author Share Posted December 10, 2018 With the disk in the raised position there is an open route for air and when lowered is seems closed. It came out of a Bret Martin box but nothing on the component indicates a part number or manufacturer. Link to comment Share on other sites More sharing options...
PeterW Posted December 10, 2018 Share Posted December 10, 2018 If it’s a BM one then there will be a part number cast into it somewhere Link to comment Share on other sites More sharing options...
epsilonGreedy Posted December 10, 2018 Author Share Posted December 10, 2018 5 minutes ago, ProDave said: If you had one that opened on positive pressure it would let all the stink into the house and might as well not be there. Ok. Just thought it was possible that venting off positive drain pipe pressure was required at times hence the part I am looking at. In my case I need an AAV for the start of the under static caravan foul drainage plan and the more I look at this component the more convinced I am that it works in reverse. I will leave the mini stack open for the moment, buy a genuine Brett Martin AAV and then compare. Link to comment Share on other sites More sharing options...
Gone West Posted December 10, 2018 Share Posted December 10, 2018 A Brett Martin AAV. 1 Link to comment Share on other sites More sharing options...
ProDave Posted December 10, 2018 Share Posted December 10, 2018 Just connect a vent stack to the static caravan, that is what I did. Link to comment Share on other sites More sharing options...
epsilonGreedy Posted December 10, 2018 Author Share Posted December 10, 2018 5 minutes ago, PeterW said: If it’s a BM one then there will be a part number cast into it somewhere I have looked in daylight, nothing to be seen. Will keep you posted on developments. Link to comment Share on other sites More sharing options...
epsilonGreedy Posted December 10, 2018 Author Share Posted December 10, 2018 @PeterStarck yes mine looks the same but in black. Can you see a part number? My box says BS487. Link to comment Share on other sites More sharing options...
epsilonGreedy Posted December 10, 2018 Author Share Posted December 10, 2018 5 minutes ago, ProDave said: Just connect a vent stack to the static caravan, that is what I did. I did not want a roof height stack because I did not want the associated the hassle and screw holes of supporting the stack hence the plan for a short external stack at about toilet seat height. Link to comment Share on other sites More sharing options...
Nickfromwales Posted December 10, 2018 Share Posted December 10, 2018 16 minutes ago, epsilonGreedy said: I did not want a roof height stack because I did not want the associated the hassle and screw holes of supporting the stack hence the plan for a short external stack at about toilet seat height. If the pipe falls less than 1300mm invert to invert you dont really need one tbh. Link to comment Share on other sites More sharing options...
Gone West Posted December 10, 2018 Share Posted December 10, 2018 6 hours ago, epsilonGreedy said: @PeterStarck yes mine looks the same but in black. Can you see a part number? My box says BS487. Yes that's what it's says on their website. http://www.brettmartin.com/en-gb/plumbing-and-drainage/products/plumbing/push-fit-soil.aspx Link to comment Share on other sites More sharing options...
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