XFITTING PEX B Compatible with all types and brands of PEX Tubing - Watts-Everhot-Viega-Zurn-Nibco-Bow-etc. 3/4 Inch Female NPT Threaded x 3/4 Inch Pex B Crimp Version, Full Port Design certified to ANSI-61/NSF product standard for use in potable water and hydronic heating water distribution. Designed for hydronic heating as well as potable water distribution. 400 PSI Approved to be used underground and behind walls without access panels 10 Pieces 3/4" Pex x 3/4" Female NPT Adapter, 23-4-2=10X (10 Packs)