Choosing the right Engine / Transmission Hydraulic Hoses for your Vessel

When choosing engine transmission hydraulic hoses, basically 3 main criteria concerns need to be addressed:

  1. The hydraulic working pressures of your transmission. As to marine transmissions used in the industry that are marketed for engines under 2000 HP, 100% of these transmissions operate at 400 PSI or less. What this means is that you need to choose a hose that easily meets & surpasses those requirements. Normally Burst Pressures are 3-4 times  that number.
  2. The hydraulic flow in Gallons per minute of the transmission you have. This requires that you choose a hose size with an inner diameter and fitting size the does not create excessive pressure drop.
  3. Choose a hose type that meets specified quality and testing requirements for the industry the hose is made for. In this case, we are talking 100% MARINE. What is easier than to choose what our tax dollars have already paid for… Choose one that meets the very high standards of the USCG.

The hoses & ends fittings that we offer: 100% USCG approved, 100% made in the USA, and certified for use on all USCG certified Vessels (Sub-charter T, Sub-chapter K, all commercially licensed vessels, and others). Using a hose with these certifications removes all the guess work and that concern is now history.

** If you do not see your transmission below or have questions about which hose is right for your application, please email Tony at [email protected] **

Choose the Correct Hose by using the Transmission Chart below:

ZF Marine Transmissions Series
ZF25, ZF45, ZF63, ZF68, ZF80, ZF85, ZF220, ZF220A, ZF280, ZF301 ZF285/286, ZF305, ZF325, ZF360, ZF370
13/32” ID
with JIC/SAE #8 fittings
1/2” ID
with JIC/SAE #8 fittings (or JIC #10) 
Twin Disc Transmissions Series
standard series & MGX series, A, SC, or V
MG5020, MG5025, MG5050, MG502,  MG506, MG5061/5062, MG5065, MG5075, MG5085 MG5086, MG5090, MG5091, MG5095/96,  MG514, MG5114
13/32” ID
with JIC/SAE #8 fittings
1/2” ID
with JIC/SAE #8 fittings (or JIC #10) 
Custom Marine (USCG Approved) Transmission Oil Line - 90xST
not rated $0.92 per inch
Product Price

Custom Marine (USCG Approved) Transmission Oil Line - 90xST
not rated $1.18 per inch
Product Price