The Graco 15G331 Pipe Plug is engineered to deliver reliable sealing solutions for a variety of industrial fluid handling setups. Crafted from durable materials and designed for easy installation, this plug ensures secure connections in spray equipment and piping assemblies. Compatible with Graco’s extensive line of spray guns and tanks, it supports efficient transfer of paints, varnishes, and other professional coatings. When paired with a airless sprayer, it delivers unmatched control and consistency.
Use of the Graco 15G331 ensures your systems maintain peak performance when working with viscous materials and heavy-duty chemicals. Its resilient seal design complements professional coatings workflows and boosts equipment longevity. Suitable for cleaning, flushing, and pressure testing, this plug supports complex fluid operations. Incorporating high-pressure filtration requirements, it also helps protect pumps, hoses, and control valves from contaminants. Trust in Graco expertise to deliver consistent, reliable results in demanding industrial settings. Engineered for both new installations and retrofit projects.
$11.02Graco’s 15G331 pipe plug is engineered to deliver reliable sealing and flow isolation in demanding industrial fluid systems. Designed to integrate seamlessly within an airless sprayer manifold or closed high-volume piping networks, this component is critical for maintaining leak-free performance under cyclic pressure conditions. Crafted from aerospace-grade stainless steel, the precision-machined NPT thread interfaces ensure full contact along the sealing surface, enhancing pump efficiency by reducing recirculation losses and transient pressure spikes. Ideal for professional coatings distribution or chemical injection loops, the plug supports records of extended wear resistance without compromising operational throughput.
The 15G331 plug features a streamlined profile that reduces flow turbulence when inserted into fluid passages or pump ports. Its compact form factor allows quick installation in tight manifold assemblies, minimizing system downtime. Integration with standard accessory ports on Graco piston pumps and diaphragm separators is facilitated by precision thread engagement, which aligns sealing faces without additional tools. Internal relief channels are engineered to prevent pressure entrapment during rapid decompression, supporting high-pressure filtration modules. Careful attention to thread root radii and flank angles enhances fatigue resistance throughout repeated service cycles.
The internal composition of the plug utilizes 17-4 PH stainless steel, selected for its superior yield strength and hardness after aging treatment. A passivation finish enhances chemical resistance against solvents, waterborne emulsions, and abrasive particulates commonly encountered in professional coatings lines. Metallurgical testing confirms uniform grain structure, minimizing susceptibility to stress corrosion cracking in elevated temperature cycles. The chosen microstructure also supports ease of pass-through inspections in high-pressure filtration setups, as the smooth bore surface reduces particle entrapment and facilitates cleaning during maintenance intervals.
In standard operation, the 15G331 pipe plug withstands continuous pressures up to 5000 psi and temperature ranges from -40 °F to 300 °F. Bench tests indicate negligible deformation under cyclic load profiles exceeding one million cycles, ensuring reliable performance in harsh environments. The precision seal interface contributes directly to improved pump efficiency by maintaining steady-state backpressure and minimizing leakage-induced power losses. Real-world trials in airless sprayer circuits confirm consistent fluid displacement without pressure spikes. Additionally, engineered contact surfaces extend seal longevity through uniform compression distribution, reducing maintenance frequency.
For optimal sealing, apply a thin coating of compatible lubricant to the NPT threads prior to engagement, ensuring uniform torque distribution. Use calibrated torque wrenches set between 50 and 70 ft-lbs based on fluid viscosity and line pressure. Align the plug squarely to avoid cross-threading, and tighten incrementally until the contact shoulder seats flush against the housing. Avoid over-torquing to preserve thread geometry and prevent galling. In systems equipped with quick-disconnect modules, verify alignment of locating pins before insertion to maintain pressure integrity and facilitate future service operations.
Routine inspections should include visual checks for surface abrasions and thread wear, especially after abrasive fluid circulation. Remove and clean the plug with non-corrosive solvents to clear particulate buildup in thread roots. Inspect sealing face for nicks or indentations that could compromise leak-free operation. Replace the 15G331 component at prescribed intervals or immediately if any surface degradation appears, as service life can vary based on fluid chemistry and thermal cycling. Proper maintenance procedures directly influence overall seal longevity and help sustain optimal pump efficiency.
The Graco 15G331 plug is fully compatible with Graco Extreme, Ultra and Xtreme series pumps, as well as legacy diaphragm metering systems. Its standardized thread profile aligns with most industrial gas and liquid handling manifolds, enabling cross-platform integration. Ideal for use in architectural coating rigs, oil-based resin transfer lines, or corrosive chemical dosing systems, this plug supports a broad spectrum of operational media. The compact design also suits retrofits in OEM machines, providing maintenance professionals with a streamlined solution to isolate sections for dynamic flow testing or system purging.
Key specifications for the 15G331 pipe plug include a 1/4" NPT thread size, 0.320" sealing face diameter, and 0.75" overall length. Maximum static pressure rating stands at 5000 psi, while cyclic rating exceeds 1,000,000 actuation cycles. The material finish rating meets ASTM A967 for passivation performance, and hardness measures 32 to 38 HRC. Weight is approximately 0.04 lbs per unit, optimizing resource allocation in high-volume assembly environments. Application of high-pressure filtration processes and solvent transfer circuits benefits from this plug’s precise tolerances and robust structural profile, ensuring reliable containment under demanding conditions.
Subscribe to our newsletter to get exclusive discounts and new theme launches right in your inbox.
You may unsubscribe at any moment. For that purpose, please find our contact info in the legal notice.
