Service Bulletin

2. For Models 03422, 03428 and 03428.
Install one Bi-directional Check Valve (112-0201) in place of the fitting for the hose at port M1
of the Manifold Block as pictured below.
Insert one (112-0201) in place
of the fitting at the M1 port
3. For Models 03540, 03541, 03543 and 03544
Install one Bi-directional Check Valve (112-0201) in place of the fitting for the hose at port M3
of the Manifold Block and one Bi-directional Check Valve (112-0201) in place of the fitting for
the hose at port M5 of the Manifold Block as pictured below.
Insert one (112-0201) in place
of the fitting at the M5 port
Insert one (112-0201) in place
of the fitting at the M3 port