Pumps, pressure, and machines that outlived their makers
Aerator for Septic Tank: How to Choose
Check system identity, airflow, pressure, dimensions, controls, treatment capacity, local approval and warranty requirements before buying.
By Walt Brenner · 11 September 2026 · 14 min readLatest
Reducing Washer: Size Selection and Bonding
Match the existing knockout to the desired fitting trade size, then verify quantity, orientation, listing, conduit compatibility and bonding.
How to Choose a Water Tank With a Pump
A selection worksheet covers demand, pressure, elevation, suction, piping, reserve, power and exposure, plus controls, certifications and total cost.
Crimped Hose Selection and Safety Checklist
Match the exact hose, coupling, ferrule, dies, crimper and current specification, then verify crimp diameter, routing and required tests.
Normally Open Contact: Meaning, Test, NO vs NC
Defines the unactuated reference state, explains what counts as actuation, and separates NO behavior from PLC logic, electrical ratings and safety.
Wiper Seals: How to Select and Install
Match gland construction and dimensions first, then verify profile, compound, fluid, temperature, speed, contamination duty and outward-facing lip orientation.
Brass PEX Pipe Fittings: How to Check Compatibility
Match purpose, size, PEX type, barb or expansion system, fastener and tool, then verify potable-water documents and complete-assembly limits.
More articles
Flex Couplings: Types, Tradeoffs & Selection
Match damping, stiffness, backlash and displacement needs, then verify torque, speed, bore, balance, materials, mounting and service limits.
Pump Tubing: How to Confirm Compatibility
For breast pumps, check the exact model, revision, connectors and dimensions; for peristaltic pumps, match the pumphead and process conditions.
Aeration Pump Sizing and Selection
Calculate target CFM and backpressure from depth, line and diffuser losses, then verify airflow on the exact model’s performance curve.
Back Pressure Regulator Valve: Operation & Selection
Maps the fluid, flow, inlet and outlet pressure, temperature, materials and discharge data needed for preliminary selection.
How to Choose a Square D Pressure Switch
Compare PSI candidates, then match the full catalog number, motor voltage, phase, horsepower, contacts, port, enclosure, mounting, and control feature.
Alternating Relays: How They Work and How to Choose
Use a sequence-first method, then compare control voltage, inputs, contacts, starter interfaces, pinouts, sockets, timing, mounting, and approvals.
Gear Coupling Types, Selection and Maintenance
Compare full-flex, flex-rigid, spacer and sliding designs, then verify torque, speed, bore, alignment, lubrication and installation requirements.
Selecting a DN15 Stainless Steel Ball Valve
Match DN15/1/2-inch connections, bore or Kv, wetted materials, pressure-temperature limits, dimensions, and actuation with a supplier checklist.
DN25 Check Valve Selection: Sizing and Compatibility
Evaluate fluid, contaminants, flow range, pressure-temperature limits, pressure loss, connections, orientation, leakage and surge before purchase.
Water Well Installation: Process, Costs & Planning
Explains how a potable well is sited, approved, drilled, connected and tested for pressure, household demand, contamination risks and water quality.
External Gear Pump: Operation, Sizing & Selection
Calculate displacement from flow, speed and efficiency, then check pressure, viscosity, inlet conditions, compatibility and performance curves.
Hydraulic Pump for Log Splitter: Sizing
Use GPM-to-horsepower ranges to narrow options, then verify stage flows, RPM, rotation, shaft, mount, ports, dimensions, and pressure ratings.