The D250 is a high pressure valve intended to be installed on leture bottles filled with various specialty gases. Mostly used in calibration applications.
Hypro D250 Diaphragm Pump – Sprayer Depot
Diaphragm seal lecture bottle valve - D250
Sloan Royal A-1042-A Urinal Diaphragm Assembly 1.0 GPF - For use with Royal Flushometers, PERMEX Synthetic Rubber Diaphragm with Dual Filtered Fixed Bypass
High pressure cylinder valve for High purity gases – D200
What calibration gases are used for?
High pressure dual port cylinder valve for High Purity gases - D265
Mudder 509229-1 822419-2 Humidifier Bottle Valve Cap Valve Caps for Humidifier Compatible with Kenmore Moistair Emerson Essick Fits for 758144071 758144170 758144070 758154200 758144150 (2) : Appliances
Constant Flow Cylinder Valve - D405
Diaphragm seal lecture bottle valve - D250