Yes they are brass and yes they are not suitable for PEX. A 3/8 pex line was started, but that's not it! generally fits well! Not recommended for installing PEX.
DIGITEN DC 12V 1/4" Inlet Feed Water Solenoid Valve Quick Connect N/C Normally Closed No Water Pressure
14 Review
High-Quality QiiMii Stainless Steel Sanitary Clamp With Silicone Gasket - 2 Inch, Single Pin Tri Clover Design
16 Review
Vacuum cleaner Dreame V9 Global, white
145 Review
Joywayus 5/8" ID Hose Barb Hex Union Brass Fitting Water/Fuel/Air With 10 Stainless Steel Clamps (Pack Of 5)
13 Review