ITEM NAME:Scuba Diving 95mm/4" Vented Standard Regulator Hose Protector Cover Yellow Description: - Materials: TPR - Length: 95mm/ 4 inches - Small end inner diameter: 12.6mm/ 0.5 inch - Large end inner diameter: 13.8mm/ 0.54 inch - Prevent low pressure hose and fittings from deformation or damage. Specification: - Works for 12.6mm low pressure hose Package Included: 1 Piece Diving LP Hose Protector Note: Hardness and softness will be influenced in different climate. If it's hard to fit on low pressure hose, you can boil the protector in boiled water for 5 minutes..Hardness and softness will be influenced in different climate. If it's hard to fit on low pressure hose, you can boil the protector in boiled water for 5 minutes. 1 Piece Diving LP Hose Protector. - Works for 12.6mm low pressure hose.