Safety raw materials. The products are made from Food-grade material which is safe, non-toxic and no odor ,meet NSF/SGS/CE standards. Durable quality. Thanks to advanced design and strict quality control in the production process, our products are durable, stable and reliable.They did not leak or burst,after experiencing 20,000 consecutive impacts with 35kg water hammer. Easy to install. We have many years of experience in producing and selling water purifier fittings.We sincerely hope that our products will improve your life.The new multi - contact design makes it more secure and reliable to connect with water tube. 20 pcs RO fittings&30 feet tubing （Ice Maker Fridge Installation Kit） 19 pcs RO fittings&30 feet tubing （with water float ball valve） 18 pcs RO fittings&30 feet tubing （with Cold Water Adapter Valve） 30 pcs RO fittings&30 feet tubing （3/8" Inch Quick Connect R.O. Fittings） 1/4" x 3/4" female thread hose bib adapter for RO filter 3/8" x 3/4" female thread hose bib adapter for RO filter Add to Cart Add to Cart Buying Options Add to Cart Add to Cart Add to Cart Customer Reviews 4.6 out of 5 stars 776 4.6 out of 5 stars 776 4.6 out of 5 stars 776 4.6 out of 5 stars 776 4.4 out of 5 stars 239 4.4 out of 5 stars 239 Price $19.88$19.88 $21.98$21.98 — no data $37.99$37.99 $12.59$12.59 $12.99$12.99 Size 1/4" Inch tube O.D. 1/4" Inch tube O.D. 1/4" Inch tube O.D. 3/8" Inch tube O.D. 1/4" Inch tube O.D. x 3/4" female thread 3/8" Inch tube O.D. x 3/4" female thread Package Quantity 21 20 19 31 6 6 You may want to know. 1.It can conduct water flow in the forward direction and cut off in the reverse direction. 2.The cracking pressure of the check valve is 7.25 PSI. 3.We have tested that the check valve does not reduce the flow of water and we don't seek to blow through it. 4.Through continuous improvement of product design, we avoid the noise caused by water flow.