1 1 4 Pex crimp mpt male pipe thread . Bag of 25 we have over 300 of this item in stock and will always ship your order the same business day we receive the order if placed before 2pm central time. * Lead free brass * durable and reliable * compatible with pex pipe * fittings work with copper crimp rings or stainless steel clamps pex fittings: all of our fittings are lead free and made to meet astm standards. Also it good to remember too that not all plastic tubing is pex there for pex fittings will not work with most other tubing. When it comes to the most cost effective long term fittings to use with your pex tubing crimp rings are the best. Cinch rings will work but they are not as good and are more expensive. Pipe clamps are another option to use but has some trade-offs. Benefit is a quick and easy fix but the tradeoff is a little more expensive and may leak down the road. The clamps will work if you have a leaky pipe and need a quick fix . About pex crimp rings: pex crimping system is the most reliable and most widely used methods of installing pex. Crimp rings ensure full 360 compression of the pipe over the barbs of the fitting without the risk of expansion or corrosion. Size of the pex crimp ring corresponds to the pex pipe size namely 1 2 crimp rings for 1 2 pex 3 4 for 3 4 and so on. Pex crimp rings are installed by positioning it over the pipe and fittings and compressing it with the help of a pex crimp crimping tool. Frequently asked questions about this produ...