Part# 05-20513


Flop tubes for inverted flight are made from Aeroquip 701-6 flexible hose. End fitting swaged onto hose has a 1/4" male pipe thread attached to tank outlet. Available for any of the tanks listed, or others. Specify tank model and tube length. Minimum length available is 9".
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So thankful that Aircraft Spruce has these available. Very nice quality piece. I thought it was also great that there are many different lengths to choose from.

August 13, 2019

The pickup on this tube has a single groove for an O-ring to act as a cushion, but the O-ring supplied is too big and falls off. I replaced it with a smaller one, but the groove is really too shallow to firmly hold an O-ring.

Cody B
May 20, 2020


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: What is the weight of the 9-inch flop tube? Regarding part # 05-20509

The approximate weight of the 9-inch flop tube is 1/2 lb.

Q: How do you measure length? End of weight to end of pipe thread?

Yes, the length of the flop tube is measured as total length of assembly, end to end. Essentially end of weight to end of pipe thread.

Q: What is the largest diameter of the assembly (how big a hole do I have to have in a tank to enter the flop tube)?

The largest diameter of the assembly is 15/16" (fattest part of weight).

Q: What size is the hose assembly? Looking for the actual hose diameter dash no. Thanks.

These are made from Aeroquip 601/701 -6 hose. The max O.D. is .571" and min I.D. is .329".

Q: What material is the weight made of?

This weight is made of Brass.

Q: Is this an NPT thread?

Yes, it is 1/4 NPT.

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