What is a Flexible Kneipple? How to use it and what it is used for

What is a flexible knipple?

Flexible Kneipples are fittings mainly used for connecting water supply pipes. Izutsu Seisakusho stocks 15A, 20A, and 25A in the same and different diameter sizes. Click here for the product page

The most common inquiry we receive from our customers is "What size O-ring do you use for flexible knipples? Looking at catalog photos and drawings, there is indeed a groove on the PF side.

However, this groove is called [relief] and is not used for attaching anything. Also, the flexible nipple is for low pressure, and if you want the O-ring groove, it is for high pressure. We also stock PTxPF hexagonal nipples with O-ring grooves. Click here for the product page

Learn how to use the flexible knipple!

The following photos show the actual process of using the FlexiKnipple.

Attach the packing to this flexible nut first.

Attach the PF side of the flexible knipple here.

Thus, the key point of the flexible knipple is to attach the packing to the nut to stop the water.