A worn seat in your internal-mix manifold allows coating to seep backwards, starving the pump and splattering the fan pattern. Swap the culprit fast with the genuine graco sprayer repair solution: the 16F323 stainless seat, cut to micron-level concentricity and polished for a leak-free seal. Each kit drops into Fusion PC, mechanical mix, and select plural-component rigs without shims or thread paste—restoring crisp shut-off and first-pull prime. Contractors who stock Graco replacement parts like this avoid costly job-site delays, while shop techs bundle the seat into scheduled graco pump kit overhauls for a full hydraulic reset. Searching for the fastest source? We at Sprayersandparts.com ship fast. Just ask “truecoat sprayer parts” on the phone call or chat to us. Keeps Graco 16F323 on the shelf, so you can fix today and spray tonight.
Inside an internal-mix gun or proportioner block, the seat check valve is the final gatekeeper that isolates A-side and B-side fluids until the trigger pulls. Once the sealing face nicks or eggs out, back-pressure bypasses the ball, unbalancing ratios, frothing coatings, and hammering pumps. Installing a fresh graco gun parts seat restores the razor-line interface that holds 3,000 PSI with zero weep, ensuring catalysts stay pure and pigment stays potent right up to the mix chamber.
These details separate a Graco seat from look-alike imports and justify specifying an graco airless sprayer valve whenever precision counts.
The 16F323 appears in Ultra Max II PC guns, Reactor plural-component blocks, and sits on the parts map for graco 395 replacement parts packages. Its 7/16-20 thread also retrofits many Magnum project guns—giving fleet managers one part number that covers both production rigs and touch-up tools.
The entire procedure fits between coat changes—ideal when uptime drives profit on magnum trueairless parts jobsites.
Match a seat swap with fresh inlet strainers and a new manifold ball to lock in full sealing integrity. When diaphragm fatigue shows, move up to a factory airless check valve assembly, or upgrade the entire lower to a quick-change block for lightning-fast service rotations.
“New seats cured our 50/50 ratio drift on hi-solids polyurea—sprayed true numbers with zero rework.”
— Isaac K., Secondary Containment Crew Chief
“Swapped 16F323 in five guns before shift; every one primed instantly and held 3200 PSI dead steady.”
— Evelyn D., Aircraft Refurb Supervisor
Because seats are tiny and inexpensive, carry six per rig alongside your paint sprayer seat kits. Technicians can solve seat erosion onsite instead of hauling tools back to the shop, keeping revenue on schedule and warranties intact.
• Persistent pressure loss during circulation.
• Off-ratio alarms on proportioners.
• Drips from mix-block weep holes.
If any appear, pull the seat first; 80 % of prime-cycle issues vanish with a new graco oem parts seat.
Hit “Add to Cart,” select fast shipping, and keep the 16F323 ready in every mobile kit. The next time a check valve falters, you’ll be back to spraying pristine finishes in the time it takes the competition to phone for tech support.
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