# What's this? **URL:** \ **Category:** Plumbing Inspections\ **Created:** [July 27, 2015, 8:52pm UTC](https://forum.nachi.org/t/whats-this/98698 "2015-07-27T20:52:00Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![kshepard](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/kshepard/32/59504_2.png) [@kshepard](https://forum.nachi.org/u/kshepard)\ **Post date:** [July 27, 2015, 8:52pm UTC](https://forum.nachi.org/t/whats-this/98698/1 "2015-07-27T20:52:00Z")
Meter connection? It specifies flow direction. ![P1010017.JPG](https://global.discourse-cdn.com/internachi/original/3X/6/9/696ec373484ada019c684bd45f7e20b4551bd156.jpeg) ---
**Author:** ![cevans](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/cevans/32/244194_2.png) [@cevans](https://forum.nachi.org/u/cevans)\ **Post date:** [July 27, 2015, 9:00pm UTC](https://forum.nachi.org/t/whats-this/98698/2 "2015-07-27T21:00:40Z")
Check valve, I would guess. ---
**Author:** ![kshepard](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/kshepard/32/59504_2.png) [@kshepard](https://forum.nachi.org/u/kshepard)\ **Post date:** [July 27, 2015, 9:30pm UTC](https://forum.nachi.org/t/whats-this/98698/3 "2015-07-27T21:30:07Z")
> [@cevans](#): > > Check valve, I would guess. That was my first guess, but there are two caps that serve some purpose. ---
**Author:** ![cevans](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/cevans/32/244194_2.png) [@cevans](https://forum.nachi.org/u/cevans)\ **Post date:** [July 27, 2015, 9:39pm UTC](https://forum.nachi.org/t/whats-this/98698/4 "2015-07-27T21:39:17Z")
> [@kshepard](#): > > That was my first guess, but there are two caps that serve some purpose. I don’t know. It could be a double, but they are usually copies of one another. Most check valves I’ve seen were mounted with the caps facing up. I was going to comment about it possibly being upside down but based on the orientation of the print that is obviously not the case. Did you by chance get a close-up where the text in the triangle is legible? The “Type 135” didn’t provide much clue. ---
**Author:** ![rlewis5](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/rlewis5/32/337040_2.png) [@rlewis5](https://forum.nachi.org/u/rlewis5)\ **Post date:** [July 27, 2015, 10:11pm UTC](https://forum.nachi.org/t/whats-this/98698/5 "2015-07-27T22:11:16Z")
I believe Chuck is correct a “Double Check”. ---
**Author:** ![kshepard](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/kshepard/32/59504_2.png) [@kshepard](https://forum.nachi.org/u/kshepard)\ **Post date:** [July 28, 2015, 2:06am UTC](https://forum.nachi.org/t/whats-this/98698/6 "2015-07-28T02:06:50Z")
> [@cevans](#): > > I don’t know. It could be a double, but they are usually copies of one another. Most check valves I’ve seen were mounted with the caps facing up. I was going to comment about it possibly being upside down but based on the orientation of the print that is obviously not the case. > > Did you by chance get a close-up where the text in the triangle is legible? The “Type 135” didn’t provide much clue. No, this is the only photo from an old inspection. ---
**Author:** ![belliott](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/belliott/32/57038_2.png) [@belliott](https://forum.nachi.org/u/belliott)\ **Post date:** [July 28, 2015, 2:18am UTC](https://forum.nachi.org/t/whats-this/98698/7 "2015-07-28T02:18:02Z")
[http://www.watercorporation.com.au/home/builders-and-developers/building/backflow-prevention/how-to-install-a-backflow-device](http://www.watercorporation.com.au/home/builders-and-developers/building/backflow-prevention/how-to-install-a-backflow-device) ![check valves.png](https://global.discourse-cdn.com/internachi/original/3X/8/9/893db5822bf73b053c4af2eba3705a92bad3f104.png) ---
**Author:** ![kshepard](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/kshepard/32/59504_2.png) [@kshepard](https://forum.nachi.org/u/kshepard)\ **Post date:** [July 28, 2015, 2:40am UTC](https://forum.nachi.org/t/whats-this/98698/8 "2015-07-28T02:40:43Z")
> [@belliott](#): > > [http://www.watercorporation.com.au/home/builders-and-developers/building/backflow-prevention/how-to-install-a-backflow-device!](http://www.watercorporation.com.au/home/builders-and-developers/building/backflow-prevention/how-to-install-a-backflow-device!) [check valves.png|540x445](https://forum.nachi.org/uploads/short-url/jA5CIeOr6iA82lb5BJXN4gCJpWs.png) I’d say that’s it, thanks Bob! ---
**Author:** ![belliott](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/belliott/32/57038_2.png) [@belliott](https://forum.nachi.org/u/belliott)\ **Post date:** [July 28, 2015, 3:13am UTC](https://forum.nachi.org/t/whats-this/98698/9 "2015-07-28T03:13:29Z")
Does not appear it would matter if they face up or down.