Drains, Inlets & Skimmers

Every pool's circulation system has two ends. On one end, water leaves the pool through skimmers and main drains and heads to the pump. On the other, filtered, heated and sanitized water comes back through return inlets and jets. The fittings that sit in the pool wall and floor at both ends are the parts swimmers actually see and touch, and they carry some of the most important safety rules in the whole system. A cracked skimmer throat, an expired drain cover or a missing return eyeball is not just a cosmetic problem; it can mean leaks, poor circulation, or a real entrapment hazard.

This category is the hub for drains, inlets and skimmers and the parts that go with them. It includes pool skimmers and skimmer parts, return inlets and eyeball jets, main drains and sumps, drain and suction covers, channel and deck drains, and the plugs used to winterize or test lines. Products come from brands such as Hayward, Pentair, Jandy/Zodiac, Waterway, CMP and Paramount. Pool builders, renovation crews and service techs shop here most, along with homeowners replacing a broken skimmer lid or a cracked eyeball fitting.

How Drains, Inlets and Skimmers Work Together

Think of the pool's plumbing as a loop. The pump pulls water from the pool, pushes it through the filter and other equipment, and sends it back. The fittings in this category control where water leaves and where it enters.

Skimmers sit at the waterline and pull surface water into a basket that catches leaves, bugs, sunscreen film and floating debris before they sink. A weir door floats with the water level to skim a thin layer off the top.
Main drains sit at the deepest point of the pool floor. They pull water from the bottom, help circulation, and are used to drain or lower the pool. Modern codes call for anti-entrapment protection, often in the form of two drains spaced apart (dual drains) or a single drain with other protection.
Drain and suction covers sit over the main drain sumps and other suction outlets. Under the Virginia Graeme Baker (VGB) Pool and Spa Safety Act, they must meet ANSI/APSP/ICC-16 standards and be rated for the flow the system can produce.
Return inlets are where clean water comes back into the pool. Directional eyeball fittings aim the flow to create a circulation pattern that moves debris toward the skimmers and mixes chemicals evenly.
Channel drains are deck drains around the pool that collect rainwater and splash-out and send it away from the pool and the house.
Plugs seal off lines for winterizing, pressure testing and repairs.

Signs Something Needs Repair or Replacement

Water loss near the skimmer. Skimmers are a common leak point, especially where the plastic body meets the concrete or where the throat meets the tile. Look for cracks, separation and dye-test movement.
Broken skimmer lid, basket or weir. Easy to replace and important. A missing lid is a trip hazard; a broken basket lets debris reach the pump.
Drain covers past their service life. Most compliant covers have a marked service life. Expired, cracked, discolored or missing covers must be replaced, and the pool should stay closed until they are.
Missing or broken return eyeballs. Poor circulation, dead spots and algae in corners can follow.
Leaks around return fittings. Cracked fittings or failed gaskets can leak behind the pool wall.
Standing water on the deck. Clogged or damaged channel drains, or drains that were never pitched correctly.
Air in the pump. Can come from a low water level pulling air through the skimmer, or a leak in a suction-side fitting.

How to Choose the Right Parts

Start with the manufacturer and model of what's already in the pool, then confirm size and type.

Identify the brand and model. Look for markings on skimmer lids, weirs and drain covers. Cover markings usually show the manufacturer, model, flow rating and service life.
Know your pool type. Concrete/gunite, vinyl-liner and fiberglass pools often use different skimmers and fittings. Vinyl and fiberglass fittings use face plates and gaskets to clamp the liner or shell.
Match the pipe and thread size. Return fittings and plugs come in common sizes such as 1.5 inch and 2 inch, with slip or threaded connections.
Check flow ratings for suction covers. Covers must be rated for the maximum flow the pump can produce through that outlet.
Consider replacement vs retrofit. For older or discontinued skimmers and drains, retrofit kits and universal covers can often fit without major demolition.
Look at the whole system. When replacing a pump with a larger one, check drain cover ratings and skimmer and return capacity at the same time.

One more rule of thumb from the service side: change one variable at a time. If you are swapping a skimmer basket, new eyeballs and a larger pump in the same visit, write down filter pressure and pump speed before and after. That makes it much easier to tell whether a new problem, like air in the pump or weak circulation, came from the fitting you just changed or something else on the system.

Part	Side of System	Main Job	Key Spec to Match
Skimmer	Suction	Remove surface debris	Pool type, model, throat size, pipe size
Main drain	Suction	Pull water from the floor	Sump size, pipe size, anti-entrapment setup
Drain or suction cover	Suction	Entrapment protection	VGB/ANSI listing, flow rating, fit, service life
Return inlet and eyeball	Return	Direct clean water back to the pool	Thread or slip size, eyeball orifice, pool type
Channel drain	Deck drainage	Carry rainwater away from the deck	Width, length, grate type, outlet size
Plug	Either	Seal lines for winterizing or testing	Fitting size, threaded or expansion type

Installation and Safety Tips

Treat suction covers as safety equipment. Install only VGB-compliant covers rated for the flow, with all screws and hardware the manufacturer supplies. Replace by the service life date. Never run a pool with a missing or broken cover.
Turn the pump off before working on any suction fitting. Lock out power and post a warning if needed.
Use the right sealant. Use products made for pool fittings and PVC. Some sealants are not safe for certain plastics or liners.
Protect the liner or shell. On vinyl and fiberglass pools, use the correct gaskets and face plates and tighten screws evenly. Overtightening can crack plastic or tear liners.
Bond where required. Some metal fittings and nearby metal must be bonded per NEC Article 680. Leave bonding to a licensed electrician or qualified pool professional.
Pressure test new plumbing. Use test plugs to pressure test lines before covering them with concrete or decking.
Keep the water at mid-skimmer. Too low pulls air; too high stops the weir from skimming.

Shopping This Category at HVAC365

Everything in this category is brand-new with the full manufacturer warranty, and product pages list sizes, flow ratings and compatibility so you can match what's already in the pool. Most items ship in 1-2 business days. If you are not sure which skimmer, cover or fitting you have, send HVAC365 photos of the markings and we can help identify it.

Frequently Asked Questions

How do I know what skimmer I have?

Look for a brand and model number on the lid, the inside of the skimmer body or the weir. The shape of the lid and throat helps too. Photos of the lid and the inside of the skimmer usually narrow it down.

Do drain covers really expire?

Yes. VGB-compliant covers are marked with a service life, often several years, because plastic weakens from UV exposure and chemicals. Replace them by that date or sooner if they look damaged.

Can I replace a skimmer without breaking the deck?

Sometimes. Skimmer repair kits and liners can fix many cracks without full replacement. A fully failed skimmer body usually requires cutting out some decking or coping.

Why are my return eyeballs important?

They aim the water to create good circulation. Pointing them correctly helps move debris toward the skimmers and keeps chemicals evenly mixed.

What is a dual main drain?

Two drains in the floor, spaced apart and plumbed together, so that if one is blocked, the other still carries the flow. It reduces the chance of strong suction at a single point.