What sizes do these thru-hull fittings come in?

They are available in two hose barb sizes: 5/8 inch (TH-652) and 1-1/8 inch (TH-1202), each sized to match standard marine hose ID.

How do I pick the right size for my boat?

Measure the inside diameter of the hose you are connecting and match it to the fitting: choose the 5/8 inch TH-652 for smaller drain or washdown lines, or the 1-1/8 inch TH-1202 for larger bilge pump discharge or livewell overflow hose.

Are these fittings straight or angled?

Both sizes are straight thru-hull fittings, meaning the body runs in a direct line rather than at a bend, which keeps plumbing runs simple in tight bilge or transom spaces.

What material are these fittings made from?

T-H Marine molds both sizes from high-quality virgin plastic material that is UV stabilized, so they resist degradation and discoloration from long-term sun exposure.

What color options are available?

Both the TH-652 and TH-1202 are offered in white; the same fittings are also available from T-H Marine in black and chrome plated versions if a different finish is needed.

What is the connector type on these fittings?

Both sizes use a hose barb connector engineered to match specifications from major hose manufacturers for a secure, leak-resistant fit.

Can I use these for bilge pump discharge?

Yes, the straight barb design and UV-stabilized plastic construction make both sizes well suited for bilge pump discharge, washdown drains, and livewell overflow applications.

Will these fittings fit through a standard hull thickness?

Both sizes are designed for typical fiberglass and aluminum hull thicknesses found on recreational boats; check your specific hull thickness against the fitting's flange and body dimensions before installation.

T-H Marine Straight Thru-Hull Fittings, White

T-H Marine Straight Thru-Hull Fittings - Available in 5/8" to 1-1/8", White

$7.14

T-H Marine's straight thru-hull fittings give boaters a durable, leak-resistant way to route bilge, washdown, and drain hoses through the hull. Molded from virgin UV-stabilized plastic in a clean white finish, each fitting features a hose barb engineered to match major hose manufacturer specifications, so the connection stays tight and secure even in high-vibration bilge environments. The straight body design keeps plumbing runs simple, avoiding the extra bend and flow restriction of angled fittings, which makes these a favorite for transom drains, bilge pump discharge, and livewell overflow lines. Choose the size that matches your existing hose ID for a proper barb fit.

Specifications

Brand: T-H Marine
Style: Straight
Color: White
Material: Plastic (virgin material, UV stabilized)
Connector Type: Barb
Sizes available: 5/8 inch and 1-1/8 inch hose ID

Sizes & Options

These thru-hull fittings are sold by hose barb size. Measure the inside diameter (ID) of the hose you are connecting and select the matching fitting: the TH-652 fits 5/8 inch ID hose, and the TH-1202 fits 1-1/8 inch ID hose. Installing the wrong size can result in a loose fit and leaks, so confirm your hose ID before ordering.

T-H Marine Straight Thru-Hull Fittings - Available in 5/8" to 1-1/8", White

Specifications

Sizes & Options

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