product description:

• Features: soft material, random shape, uniform air outlet, super durable, used with oxygen pump (requires installation of check valve)
• Specifications: Single head means that one end is an air inlet and the other end is sealed. Double head means that both ends are air intake holes, which need to be used with an oxygen booster pump with double air holes.
• Length: 20cm 30cm 45cm 60cm 75cm 90cm 105cm 200cm
• Interface diameter: 4~5.5mm

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On 06-Jun-22 at 07:51:17 BST, seller added the following information: