The PO had purchased some premade 3/8 assemblies from KR, with red air hose...They didn't seem to last very long at all. When they started failing, I replaced them with 3/8" black "Goodyear" Air Hose cut to length so the hose does not drag the bay floor when holstered...I Crimp my own 3/8" ends on each end with strain reliefs. I have yet to replace one and they were all installed over 8 years ago. I even have them in an open truck bay, direct sunlight and have never had one fail. Fb and PS/TF gun....The hose is light, doesn't degrade in open sunlight, lasts for years, and if you can crimp your own ends, no need to stock precut hoses...Just make a new one when you need one! A 50' length of air hose will make at least 3 assemblies.