McFarlane Aviation Products - 3750

Part Number: 3750

VALVE, Fuel Drain, 3/8""-24

Product Details


Thread Locking Flush Mounted Open Action Use Pin Type Cup Material Approval
3/8-24 UNF Yes No Push Yes 360 Brass FAA-TSO-C76


Thread: "UNF" (Fine thread) type are straight, non-sealing threads that rely on an O-ring to provide a seal. "NPT" (Pipe thread) type are tapered thread that seal as they are tightened. Measure the O.D. of the thread on the valve you are replacing and compare to the thread specifications table to determine the correct thread size.
Locking: Valve locks in the open position for easy draining.
Flush mounted: Valve is designed to mount flush with aircraft skin.
Use Pin Type Cup: Pin type cups similar to MCCCA-39680 may be used with indicated valves for sampling fuel.
Open Action: "Spiral" valves require a push and turn action to open. "Push" valves require a push action to open.
Hose Adapter Size: A hose may be attached to the valve for ease of draining fuel. The size is the hose I.D.



SAF-AIR Lock Open Fuel Drain Valves
A clean no mess way to test and drain fuel! 

Lock open fuel drain valves lock in the open position. This makes the pre-flight check for contamination and water in the fuel system very easy. 

Determine part number by the thread size required. Thread sizes offered: 1/8 NPT, NPT, 3/8-24, 7/16-20. Part numbers with an H have a hose adapter built into the part. On models 1250, 1250H, 2500 and 2500H there is no O-ring where it screws together. 


FAA and TSO-C76 Approved

  • Eight models in two styles with or without 1/4" hose adapter 
  • All valves can be rebuilt
  • Standard fuel resistant O-rings included
  • Effortless operation with sure grip knob
  • Simple operation - Push to test or push-and-turn to lock open
  • Maintenance Tips


Find the replacement O-ring kit for your SAF-AIR valve: O-Ring Kits.

All SAF-AIR O-rings are made of Viton.


Eligible Aircraft

Make Series Model Beginning S/N Ending S/N Comment Eligibility Chart
Many Many Many 0 ZZZZZZZZZZZZZZZ FAA & TSO-C76 Approved. Installer must determine eligibility. 6637

Frequently Asked Questions

How do I maintain my fuel and oil drain valves?
How do I keep contaminants out of my fuel system?

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Please verify product details for suitability for your application.

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