Boston gear
SPECIFICATIONS
Max. Operating Pressure – 2000 PSI
Operating Temperature Range – –15° to +400°F
Standard Cracking Pressure – 1 to 2.5 PSI
Materials: Housing – Brass
Needle – Brass
Washer – Teflon
Knob – Aluminum
Ball – Stainless Steel
Retainer – Stainless Steel
O-Ring – Viton
https://www.bostongear.com/-/media/Files/Literature/Brand/boston-gear/catalogs/p-1483-bg-sections/p-1483-bg-accessories.ashx