Ralston Instruments QTHA-KIT30 Click link for DP Transmitters each fitting works for (under specifications). 

Quick-test DP Transmitter Stinger Probe Connection Kit

Connect to a wide variety of models of DP transmitters via the bleed port using a Quick-test hose

• 1/4-28 UNF: 1/4"-28 UNF X male Quick-test, no check-valve, S.S.
• M8x1.25: DP Transmittter adapter for DP Transmitters with M8 x 1.25 bleed plugs, S.S.
• 1/4-20 UNC: 1/4"-20 UNC Male Bleed Port x male Quick-test adapter, S.S.
• M8x1.0: M8 x 1.0 gauge valve bleed port x male Quick-test adapter, S.S.
• Hose: Quick-test 6900 psi hose, S.S. hose ends, 3 ft (92 cm) long
• 5/16-24 UNF: 5/16"-24 UNF x male Quick-test, no check-valve, S.S.
• Bag: Zippered bag to hold hose and adapters, nylon