Pneumatic tool hose as breathing hose

[Thalassamania]

The primary difference between all the less expensive hoses and the hoses that are used in diving umbilicals is that diving umbilicals have a "star" shaped cross-section that prevents them from cutting off your air if they kink. You can, under some circumstances, get away with things as foolish as garden hose.

 

[sealark]

Never use regular hose for diving they could have bad chemicals in them. Any of the hose manufactures and hose shops sell BA hose that means breathing air. It's a little more expensive but worth it. Keane engineering sells yellow floating BA hose. Just make sure it's rated BA hose.