Questions and answers

Can you use compression fittings on poly pipe?

Can you use compression fittings on poly pipe?

Compression style fitting offers good flow characteristics because the interior of the tubing is unencumbered by inserts such as barbs. These can be used on softer tubing (i.e. polyethylene) which can collapse easily when overtightening compression fittings or bending near the end of the tubing.

What thread is a 1/4 compression fitting?

| How to Measure a Threaded Fitting

Tube Size Nominal Size Female Thread I.D.
1/4″ 7/16″ 25/64″
5/16″ 1/2″ 29/64″
3/8″ 9/16″ 1/2″
1/2″ 3/4″ 11/16″

Do plumbers use compression fittings?

Compression fittings in the world of plumbing are very common. They are a safe way to connect copper pipe without the use of heat making them popular with DIY’ers. Many different types of valves, tees, connectors and utilities require compression fittings in order to make them water tight and safe.

Should I use Teflon tape on compression fittings?

Thread sealants such as joint compound (pipe dope or thread seal tape such as PTFE tape) are unnecessary on compression fitting threads, as it is not the thread that seals the joint but rather the compression of the ferrule between the nut and pipe.

Does NPT fit MIP?

Yes, NPT (national pipe thread) has the same thread dimensions as an MIP (male iron pipe) and FIP (female iron pipe).

Can you reuse plastic compression fittings?

Compression fittings are not as robust as soldered fittings. It can never be reused once they have been compressed. This connector is directly placed over the pipe and the nut is tightened compressing the ferrule between the pipe and the body of the fitting.

How tight should compression fittings be?

Really you should only tighten a compression fitting about 1.25 turns, but I like to do turns in small increments and check for leaks after each turn. You can always tighten a compression fitting more, but you can’t un-tighten a compression fitting.

What is the most common cause of leaking compression fittings?

It is critical to avoid over-tightening the nut or else the integrity of the compression fitting will be compromised by the excessive force. If the nut is overtightened the ferrule will deform improperly causing the joint to fail. Indeed, overtightening is the most common cause of leaks in compression fittings.

Can you over tighten compression fittings?

If the pipe is clean and cut properly, compression fittings work well. In the trade, it’s said to not over tighten a compression fitting, leaving you more thread in the case of a leak. After hand tightening a nut will need one whole turn.

What are the different types of poly pipe fittings?

Types of Polyethylene Fittings There are poly fittings, but they are rarely used and typically only in industrial application. When we refer to “poly fittings”, we mean fittings made of materials that are compatible with poly pipe.

Which is the best hydraulic compression tube fitting?

These fittings have the highest pressure rating of all the Yor-Lok tube fittings we offer. Also known as JIC (Joint Industrial Council) fittings, these provide a tight metal-to-metal seal on stainless steel tubing that is flared to 37°.

What can I use between compression sleeve fittings?

Often used between fittings and tubes, each 1/4 in. Compression Sleeve is corrosion resistant. Can be used with copper, brass, aluminum or plastic. Not for use underground. You will need Adobe® Acrobat® Reader to view PDF documents.

What are the elbow fittings for poly pipe?

Elbow fittings allow you to change the direction of your piping/tubing in a 90-degree angle. The Adapter fittings can help when it is necessary to go from a male to a female connection. Also for a connection that uses Tuff Tube, and you are going from the Tuff Tube (Bolted Down, or tightened with a nut) to a threaded connection.