These products make up the 40mm range of Plasson (Made in Israel) fittings to suit metric poly pipe. In my opinion with 30+ years of experience using and selling fittings, the Plasson fitting provides a superior connection to any brand of metric poly pipe. I have never had a Plasson fitting fail, and, if you install the fittings as per the instructions, they will never leak! Plasson compression fittings are Watermark Approved and suitable for use with drinking water. Standard Plasson fittings are designed to operate at up to 1,600 kPa.