diff --git a/src/Hydraulic/IsothermalCompressible/components.jl b/src/Hydraulic/IsothermalCompressible/components.jl
index be891ee4c..f7512bc48 100644
--- a/src/Hydraulic/IsothermalCompressible/components.jl
+++ b/src/Hydraulic/IsothermalCompressible/components.jl
@@ -10,17 +10,21 @@ Caps a hydraulic port to prevent mass flow in or out.
 # Connectors:
 - `port`: hydraulic port
 """
-@component function Cap(; name)
-    vars = @variables p(t), [guess = 0]
+@mtkmodel Cap begin
 
-    systems = @named begin
+    @variables begin
+        p(t), [guess = 0]
+    end 
+
+    @components begin
         port = HydraulicPort()
     end
 
-    eqs = [port.p ~ p
-           port.dm ~ 0]
+    @equations begin
+        port.p ~ p
+        port.dm ~ 0
+    end
 
-    ODESystem(eqs, t, vars, []; name, systems)
 end
 
 """
@@ -34,22 +38,22 @@ Provides an "open" boundary condition for a hydraulic port such that mass flow `
 # Connectors:
 - `port`: hydraulic port
 """
-@component function Open(; name)
-    pars = []
+@mtkmodel Open begin
 
-    vars = @variables begin
+    @variables begin
         p(t), [guess = 0]
         dm(t), [guess = 0]
     end
 
-    systems = @named begin
+    @components begin
         port = HydraulicPort()
     end
 
-    eqs = [port.p ~ p
-           port.dm ~ dm]
+    @equations begin
+        port.p ~ p
+        port.dm ~ dm
+    end
 
-    ODESystem(eqs, t, vars, pars; name, systems)
 end
 
 """
@@ -238,33 +242,33 @@ Reduces the flow from `port_a` to `port_b` by `n`.  Useful for modeling parallel
 - `port_a`: full flow hydraulic port
 - `port_b`: part flow hydraulic port
 """
-@component function FlowDivider(; n, name)
+@mtkmodel FlowDivider begin
 
     #TODO: assert n >= 1
 
-    pars = @parameters begin
+    @parameters begin
         n = n
     end
 
-    vars = @variables begin
+    @variables begin
         dm_a(t), [guess = 0]
         dm_b(t), [guess = 0]
     end
 
-    systems = @named begin
+    @components begin
         port_a = HydraulicPort()
         port_b = HydraulicPort()
         open = Open()
     end
 
-    eqs = [connect(port_a, port_b, open.port)
-           dm_a ~ port_a.dm
-           dm_b ~ dm_a / n
-           open.dm ~ dm_a - dm_b # extra flow dumps into an open port
-           # port_b.dm ~ dm_b # divided flow goes to port_b
-           ]
+    @equations begin
+        connect(port_a, port_b, open.port)
+        dm_a ~ port_a.dm
+        dm_b ~ dm_a / n
+        open.dm ~ dm_a - dm_b # extra flow dumps into an open port
+        # port_b.dm ~ dm_b # divided flow goes to port_b
+    end
 
-    ODESystem(eqs, t, vars, pars; name, systems)
 end
 
 @component function ValveBase(
@@ -357,18 +361,23 @@ Valve with `area` input and discharge coefficient `Cd` defined by https://en.wik
     ODESystem(eqs, t, vars, pars; name, systems)
 end
 
-@component function VolumeBase(; area, dead_volume = 0, Χ1 = 1, Χ2 = 1,
-        name)
-    pars = @parameters begin
-        area = area
-        dead_volume = dead_volume
+@mtkmodel VolumeBase begin
+
+    @structural_parameters begin
+        Χ1 = 1
+        Χ2 = 1
     end
 
-    systems = @named begin
+    @parameters begin
+        area
+        dead_volume
+    end
+
+    @components begin
         port = HydraulicPort()
     end
 
-    vars = @variables begin
+    @variables begin
         x(t)
         dx(t), [guess = 0]
         rho(t), [guess = liquid_density(port)]
@@ -376,17 +385,14 @@ end
         vol(t)
     end
 
-    # let
-    dm = port.dm
-    p = port.p
-
-    eqs = [vol ~ dead_volume + area * x
-           D(x) ~ dx
-           D(rho) ~ drho
-           rho ~ full_density(port, p)
-           dm ~ drho * vol * Χ1 + rho * area * dx * Χ2]
+    @equations begin
+        vol ~ dead_volume + area * x
+        D(x) ~ dx
+        D(rho) ~ drho
+        rho ~ full_density(port, port.p)
+        port.dm ~ drho * vol * Χ1 + rho * area * dx * Χ2
+    end
 
-    ODESystem(eqs, t, vars, pars; name, systems)
 end
 
 """
@@ -400,33 +406,31 @@ Fixed fluid volume.
 # Connectors:
 - `port`: hydraulic port
 """
-@component function FixedVolume(; vol, name)
-    pars = @parameters begin
-        vol = vol
+@mtkmodel FixedVolume begin
+
+    @parameters begin
+        vol
     end
 
-    systems = @named begin
+    @components begin
         port = HydraulicPort(;)
     end
 
-    vars = @variables begin
+    @variables begin
         rho(t), [guess = liquid_density(port)]
         drho(t), [guess = 0]
     end
 
-    # let
-    dm = port.dm
-    p = port.p
-
-    eqs = [D(rho) ~ drho
-           rho ~ full_density(port, p)
-           dm ~ drho * vol]
+    @equations begin
+        D(rho) ~ drho
+        rho ~ full_density(port, port.p)
+        port.dm ~ drho * vol
+    end
 
-    ODESystem(eqs, t, vars, pars; name, systems)
 end
 
 """
-    Volume(; x, dx=0, p, drho=0, dm=0, area, direction = +1, name)
+    Volume(; x, dx=0, p, drho=0, dm=0, area, direction = 1, name)
 
 Volume with moving wall with `flange` connector for converting hydraulic energy to 1D mechanical.  The `direction` argument aligns the mechanical port with the hydraulic port, useful when connecting two dynamic volumes together in oppsing directions to create an actuator.
 
@@ -463,16 +467,17 @@ dm ────►               │  │ area
 
 See also [`FixedVolume`](@ref), [`DynamicVolume`](@ref)
 """
-@component function Volume(;
+@mtkmodel Volume begin
 
-        #parameters
-        area,
-        direction = +1, name)
-    pars = @parameters begin
-        area = area
+    @structural_parameters begin
+        direction = 1
     end
 
-    vars = @variables begin
+    @parameters begin
+        area
+    end
+
+    @variables begin
         x(t)
         dx(t)
         p(t)
@@ -482,32 +487,36 @@ See also [`FixedVolume`](@ref), [`DynamicVolume`](@ref)
         dm(t)
     end
 
-    systems = @named begin
+    @components begin
         port = HydraulicPort()
         flange = MechanicalPort()
     end
 
-    eqs = [
-           # connectors
-           port.p ~ p
-           port.dm ~ dm
-           flange.v * direction ~ dx
-           flange.f * direction ~ -f
+    @equations begin
+        # connectors
+        port.p ~ p
+        port.dm ~ dm
+        flange.v * direction ~ dx
+        flange.f * direction ~ -f
 
-           # differentials
-           D(x) ~ dx
-           D(rho) ~ drho
+        # differentials
+        D(x) ~ dx
+        D(rho) ~ drho
 
-           # physics
-           rho ~ liquid_density(port, p)
-           f ~ p * area
-           dm ~ drho * x * area + rho * dx * area]
+        # physics
+        rho ~ liquid_density(port, p)
+        f ~ p * area
+        dm ~ drho * x * area + rho * dx * area
+    end
+
+    @defaults begin
+        rho => liquid_density(port)
+    end
 
-    ODESystem(eqs, t, vars, pars; name, systems, defaults = [rho => liquid_density(port)])
 end
 
 """
-    DynamicVolume(N, add_inertia=true; p_int,  area, x_int = 0, x_max, x_min = 0, x_damp = x_min, direction = +1, perimeter = 2 * sqrt(area * pi), shape_factor = 64, head_factor = 1, Cd = 1e2, Cd_reverse = Cd, name)
+    DynamicVolume(N, add_inertia=true, reversible=false; area, x_int = 0, x_max, x_min = 0, x_damp = x_min, direction = +1, perimeter = 2 * sqrt(area * pi), shape_factor = 64, head_factor = 1, Cd = 1e2, Cd_reverse = Cd, name)
 
 Volume with moving wall with `flange` connector for converting hydraulic energy to 1D mechanical.  The `direction` argument aligns the mechanical port with the hydraulic port, useful when connecting two dynamic volumes together in oppsing directions to create an actuator.
 
diff --git a/src/Hydraulic/IsothermalCompressible/sources.jl b/src/Hydraulic/IsothermalCompressible/sources.jl
index ee21959d7..64b182f11 100644
--- a/src/Hydraulic/IsothermalCompressible/sources.jl
+++ b/src/Hydraulic/IsothermalCompressible/sources.jl
@@ -8,20 +8,16 @@ Hydraulic mass flow input source
   - `port`: hydraulic port
   - `dm`: real input 
 """
-@component function MassFlow(; name)
-    pars = []
+@mtkmodel MassFlow begin
 
-    systems = @named begin
+    @components begin
         port = HydraulicPort()
         dm = RealInput()
     end
 
-    vars = []
-    eqs = [
+    @equations begin
         port.dm ~ -dm.u
-    ]
-
-    ODESystem(eqs, t, vars, pars; name, systems)
+    end
 end
 
 """
@@ -35,22 +31,20 @@ Fixed pressure source
 # Connectors:
 - `port`: hydraulic port
 """
-@component function FixedPressure(; p, name)
-    pars = @parameters begin
-        p = p
-    end
+@mtkmodel FixedPressure begin
 
-    vars = []
+    @parameters begin
+        p
+    end
 
-    systems = @named begin
+    @components begin
         port = HydraulicPort()
     end
 
-    eqs = [
+    @equations begin
         port.p ~ p
-    ]
+    end
 
-    ODESystem(eqs, t, vars, pars; name, systems)
 end
 @deprecate Source FixedPressure
 
@@ -63,19 +57,16 @@ input pressure source
 - `port`: hydraulic port
 - `p`: real input 
 """
-@component function Pressure(; name)
-    pars = []
-    vars = []
+@mtkmodel Pressure begin
 
-    systems = @named begin
+    @components begin
         port = HydraulicPort()
         p = RealInput()
     end
 
-    eqs = [
+    @equations begin
         port.p ~ p.u
-    ]
+    end
 
-    ODESystem(eqs, t, vars, pars; name, systems)
 end
 @deprecate InputSource Pressure