Replaces Wagner SprayTech 13359 Outlet/Piston Valve Seat – 945, 975, EP & EPX

Replaces Wagner SprayTech 13359 Outlet/Piston Valve Seat – 945, 975, EP & EPX

Service the fluid section on your Wagner SprayTech airless sprayer with this aftermarket outlet/piston valve seat that replaces SprayTech Part #13359.

The 13359 valve seat is part of the piston outlet check-valve assembly inside the displacement pump. It provides the sealing surface for the outlet valve ball, helping control material flow through the fluid section during each pump stroke.

Part Information:

• Replaces Wagner SprayTech Part Number: 13359
• Product: Outlet / Piston Valve Seat
• Type: Aftermarket
• Application: Fluid Section / Piston Outlet Valve
• Equipment Type: Professional Airless Paint Sprayer
• Brand Compatibility: Wagner SprayTech and related private-label equipment

Fits Wagner SprayTech Equipment:

SprayTech Models

• 400 SE
• 500 / Amspray 500
• 500 SE
• 935
• 945
• 975
• Avenger
• Blue Max
• Corsair
• Model 4
• Model 6
• Sprint
• SPC 3000 GE
• SPC 3900

EP Series

• EP 2100
• EP 2105
• EP 2205
• EP 2300
• EP 2300 SE
• EP 2400

EPX Series

• EPX 2155
• EPX 2255

Additional SprayTech-Branded Equipment

• Fuller O'Brien Chief
• Fuller O'Brien Warrior
• MAB Cheetah
• MAB Cougar
• Sinclair SPC 2000
• Sinclair SPC 3000

Also Used on Private-Label Equipment:

Amspray

• 500
• Avenger
• Blue Max
• Corsair
• Fuller O'Brien Chief
• Fuller O'Brien Warrior
• MAB Cheetah
• MAB Cougar
• Model 4
• Model 6
• Sinclair SPC 2000
• Sinclair SPC 3000
• SPC 3000 GE
• Sprint

Sherwin-Williams

• SW419 – EP Style
• SW419 – EPX Style
• SW521
• SW623 – EP Style
• SW623 – EPX Style

Glidden / ICI

• 400 SE
• 500
• 500 SE
• Sprint

Features:

• Replaces Wagner SprayTech 13359
• Outlet valve seat located in the piston assembly
• Commonly referred to as a piston valve seat
• Fits numerous older SprayTech fluid sections
• Broad compatibility with EP and EPX series equipment
• Fits several private-label versions of SprayTech sprayers
• Quality aftermarket repair component
• Helps restore proper outlet check-valve sealing
• Ideal for fluid-section rebuilding and maintenance
• Helps keep older professional airless equipment in service

What the 13359 Valve Seat Does

The fluid section uses inlet and outlet check valves to move coating through the pump while preventing material from flowing backward.

The 13359 seat works with the outlet valve ball in the piston assembly. As the piston reciprocates, the ball repeatedly opens and closes against this seat.

When the ball and seat are in good condition, the valve seals during the appropriate portion of the pump stroke. If the seat becomes worn, pitted, eroded, or damaged, material can bypass the valve and reduce pump performance.

Common Signs of a Worn Piston Valve Seat:

• Pump has difficulty building pressure
• Sprayer will not maintain pressure
• Excessive cycling with the spray gun closed
• Reduced fluid output
• Erratic or fluctuating pressure
• Difficulty priming
• Inconsistent material delivery
• Visible pitting or erosion of the seat
• Outlet valve ball does not seal properly

Inspect the Ball With the Seat

The valve ball and seat operate together as a sealing pair.

When replacing the 13359 valve seat, inspect the mating outlet valve ball carefully. A ball that is worn, pitted, corroded, or damaged may not seal properly even against a new seat.

While the fluid section is apart, it's also a good time to inspect the:

• Outlet valve ball
• Piston / displacement rod
• Cylinder
• Upper and lower packings
• Packing glands
• Inlet valve ball and seat
• O-rings and seals
• Valve cages and retainers

Don't Automatically Blame the Packings

This is especially useful when troubleshooting one of these older SprayTech pumps.

A sprayer that won't build or maintain pressure doesn't necessarily need packings. A leaking inlet or piston outlet check valve can produce many of the same symptoms.

If the packings appear serviceable but the pump is still losing pressure internally, inspect the valve balls and seats for wear or contamination before condemning the entire fluid section.

Finding Parts for Older SprayTech Equipment

Older Wagner SprayTech equipment can be particularly confusing because many machines were sold under Amspray, Glidden/ICI, Sherwin-Williams, Fuller O'Brien and other private-label names.

The name printed on the sprayer isn't always the best way to identify the correct fluid-section component.

That's why we include the original SprayTech part number and known equipment applications whenever possible. If the parts breakdown for the fluid section installed on your machine specifies 13359, this is the piston/outlet valve seat you're looking for.

Important:

This listing is for one aftermarket outlet/piston valve seat that replaces Wagner SprayTech Part #13359.

The outlet valve ball, piston assembly, packings, glands and other fluid-section components are sold separately unless specifically stated otherwise.

This is an aftermarket component and is not manufactured by Wagner or SprayTech.

Because many of these sprayers are older and may have been rebuilt or fitted with a different fluid section during their service life, always verify Part #13359 in the parts breakdown for the pump currently installed on your equipment before ordering.

Completely relieve fluid pressure, disconnect power, and follow the manufacturer's pressure-relief procedure before servicing any airless sprayer fluid section.

Need help identifying fluid-section parts for an older Wagner, SprayTech, Amspray or private-label airless sprayer? Contact us with your sprayer model and original part number—we'll help you find the correct parts to keep your equipment working.