1|Page
ABYC SYSTEMS CERTIFICATION EXAM
REVIEW |MARINE TECHNICIAN PREP
2026
Whenever components are installed below the max heeled water line - to prevent
back flow into the vessel or unintentional siphoning of untreated effluent
overboard. - correct-answer -When and why must siphon breaks be installed in a
sewage system?
True - correct-answer -A seacock may be installed instead of a siphon break to
prevent discharge and back siphoning. T or F?
The handle must be lockable in the direction of the holding tank - correct-answer
-What special provision must be included for a sewage y-valve when the discharge
seacock is not lockable?
Air Gap, Vacuum Break, Double Check Valve, Dedicated Water Tank - correct-
answer -Name four ways to separate a fresh water flushing system from potable
water system.
,2|Page
1.5 inches - correct-answer -What is the minimum hose ID for use on un-
macerated sewage?
Secure mounting to minimize vibration effect, use flexible hose to connect to
fitting and hull. - correct-answer -What provisions should be made if using rigid
PVC for sewage?
linear or cross-linked polyethylene, 1/4 inch thick or greater. - correct-answer -
What plastic material is recommended for sewage holding tanks?
Epoxy and Vinyl Esther are ok, but polyester resin is not because of susceptibility
to osmotic blistering. - correct-answer -Of the three major type of Fiberglass
Reinforced Plastic (FRP), which one is not recommended and why?
5/8 inch - correct-answer -A removable holding tank's vent line shall be what
minimum diameter?
8 lbs - correct-answer -What is the approximate weight of a gallon of sewage?
,3|Page
2X weight of tank and contents when full - correct-answer -What safety factor
shall be utilized when determining necessary restraining forces for installation of
a holding tank?
neoprene, bonded to tank surface with non-hydroscopic adhesive. - correct-
answer -What material is recommended to be used to prevent chafe between
metallic tanks and tank supports, bracing, etc?
Similar coefficient of thermal expansion - helps prevent leaks. - correct-answer -
Why is it recommended to use plastic fittings with plastic holding tanks?
1.5 inch, internal national pipe thread (NPT) - liquid and vapor tight. - correct-
answer -What type of fitting shall be used for deck pump-out?
True - correct-answer -True or False: holding tank vent line shall have a constant
rise from the top of the tank to the vent fitting and be as short as possible.
True - correct-answer -Only anaerobic bacterial produce a smell. T or F?
24 inches - correct-answer -What is the minimal distance allowed between a
holding tank vent fitting and any opening into an accommodation space?
, 4|Page
True. Maceration does not reduce bacteria content. - correct-answer -A
macerator pump is not a Type I, II, or III MSD.
False. - correct-answer -T or F: All macerator pumps are self-priming
Diaphragm Pump - correct-answer -What type of pump is used for flushing a
toilet?
True - correct-answer -Diaphragm pumps are self-priming, T or F?
False. Should be above top of tank to prevent back filling with sewage when tank
is full. - correct-answer -To facilitate flushing, the toilet diaphragm pump should
be located below the level of the top of the holding tank.
True - correct-answer -Federal regulations require that all holding tanks have a
means for indicating when the tank is 3/4 full by volume. T or F?
ABYC SYSTEMS CERTIFICATION EXAM
REVIEW |MARINE TECHNICIAN PREP
2026
Whenever components are installed below the max heeled water line - to prevent
back flow into the vessel or unintentional siphoning of untreated effluent
overboard. - correct-answer -When and why must siphon breaks be installed in a
sewage system?
True - correct-answer -A seacock may be installed instead of a siphon break to
prevent discharge and back siphoning. T or F?
The handle must be lockable in the direction of the holding tank - correct-answer
-What special provision must be included for a sewage y-valve when the discharge
seacock is not lockable?
Air Gap, Vacuum Break, Double Check Valve, Dedicated Water Tank - correct-
answer -Name four ways to separate a fresh water flushing system from potable
water system.
,2|Page
1.5 inches - correct-answer -What is the minimum hose ID for use on un-
macerated sewage?
Secure mounting to minimize vibration effect, use flexible hose to connect to
fitting and hull. - correct-answer -What provisions should be made if using rigid
PVC for sewage?
linear or cross-linked polyethylene, 1/4 inch thick or greater. - correct-answer -
What plastic material is recommended for sewage holding tanks?
Epoxy and Vinyl Esther are ok, but polyester resin is not because of susceptibility
to osmotic blistering. - correct-answer -Of the three major type of Fiberglass
Reinforced Plastic (FRP), which one is not recommended and why?
5/8 inch - correct-answer -A removable holding tank's vent line shall be what
minimum diameter?
8 lbs - correct-answer -What is the approximate weight of a gallon of sewage?
,3|Page
2X weight of tank and contents when full - correct-answer -What safety factor
shall be utilized when determining necessary restraining forces for installation of
a holding tank?
neoprene, bonded to tank surface with non-hydroscopic adhesive. - correct-
answer -What material is recommended to be used to prevent chafe between
metallic tanks and tank supports, bracing, etc?
Similar coefficient of thermal expansion - helps prevent leaks. - correct-answer -
Why is it recommended to use plastic fittings with plastic holding tanks?
1.5 inch, internal national pipe thread (NPT) - liquid and vapor tight. - correct-
answer -What type of fitting shall be used for deck pump-out?
True - correct-answer -True or False: holding tank vent line shall have a constant
rise from the top of the tank to the vent fitting and be as short as possible.
True - correct-answer -Only anaerobic bacterial produce a smell. T or F?
24 inches - correct-answer -What is the minimal distance allowed between a
holding tank vent fitting and any opening into an accommodation space?
, 4|Page
True. Maceration does not reduce bacteria content. - correct-answer -A
macerator pump is not a Type I, II, or III MSD.
False. - correct-answer -T or F: All macerator pumps are self-priming
Diaphragm Pump - correct-answer -What type of pump is used for flushing a
toilet?
True - correct-answer -Diaphragm pumps are self-priming, T or F?
False. Should be above top of tank to prevent back filling with sewage when tank
is full. - correct-answer -To facilitate flushing, the toilet diaphragm pump should
be located below the level of the top of the holding tank.
True - correct-answer -Federal regulations require that all holding tanks have a
means for indicating when the tank is 3/4 full by volume. T or F?
