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trex
June 2nd, 2008, 10:28 AM
We recently bought a house with an in-ground sprinkler system (quite old). The folks who owned it before us never used it and trying to get it working has been an experience. (For starters, one loop apparently is under a newer detached garage and one sprinkler was in the middle of a gravel driveway. Neat.)

As the photo will show, the controls are strictly manual, which is fine by us. An inlet pipe comes from the house (shutoff valve inside) and then goes through a manifold to the five sprinkler loops. The ball valves are rusty on the outside but work well. They marry up to the manifold via an internally-threaded 3/4" connector.

The problem is the manifold arrangement. It involves over a dozen hose clamps and there is a persistent slow leak which four or five skinned knuckles have not been able to cure.

I had thought of putting together a replacement manifold of ABS or equivalent, which would be less likely to leak. The specific problem is that my local hardware store cannot make any suggestions as to how to connect the manifold to the ball valves.

I would appreciate any suggestions. Thanks.

Gary Slusser
June 2nd, 2008, 11:31 AM
You can use sch 40 PVC but, with threaded valves, you must be able to rotate either them or the MPT adapter that screws into them to tighten them. So you would be redoing the whole thing.

Your valves are brass, they don't rust, they corrode a bit.

If it were mine, although you don't say where or which fitting is leaking, I'd redo the leaker with a new piece of the same PE pipe you have now. BTW, the primary cause of insert fitting leaks is over tightening of the hose clamps... You can add another hose clamp to the leaker, just leave a narrow space between the two. You can buy a T handled hose clamp torque wrench at most plumbing or pump supply houses.

trex
June 2nd, 2008, 12:03 PM
Thanks.

I have replaced that section several times, as well as the fitting. I guess I will try it again and tighten the clamps gently and gradually.

If that doesn't work, it is an MPT adaptor I should be asking for to connect?

CR500
June 2nd, 2008, 12:17 PM
How about slobbering some Rectorseal on the fittings?

I completely disconnect / reconnect my parents pool fittings every year. A little rector seal and double hose clamps and it never leaks.

trex
June 2nd, 2008, 12:50 PM
Rectorseal. Never heard of it but will look into it. Thanks.

fordrules
June 3rd, 2008, 10:38 PM
Rectorseal is a brand of pipe dope, or thread sealer. What the plumbers at work do is put on teflon tape, and pipe dope, and we never have problems with leaks at joints.

http://www.rectorseal.com/index.php?site_id=1&product_id=212

Gary Slusser
June 4th, 2008, 01:16 AM
The only thing you want on hose clamped insert/barbed fittings is correctly torqued hose clamps.