Product Overview
Marine Stainless-Steel Round Garboard Drain Plug – Model ZB1901
RICHWITS garboard plug lets you empty the bilge in seconds and seal it watertight for the season.
CNC-machined from solid 316 SS, molybdenum-stabilised for lifetime immunity to salt water, brine and tropical humidity.
One-piece 4.5 mm thick body—20 % heavier than DIN 86261—handles grounding impact and torque from over-zealous yard crews.
Tapered NBR/Teflon composite washer (included) compresses to ±0.2 mm, giving 100 % seal on gel-coat, timber or aluminium hulls from 4 mm to 18 mm thickness.
Dimension & Weight
| CODE | Thread Size | A mm | B mm | C mm | D mm | E mm | F mm | Hex | WT kg | Hull Thickness |
| ZB1901 | 1/2" NPT | 50.0 | 33.0 | 32.0 | 4.5 | 24.5 | 5.2 | 22 mm | 0.110 | 4–18 mm |
Key Features & Benefits
316 SS One-Piece Body – zero weld seams, zero rust, zero electrolysis.
Tapered Pipe Thread 1/2" NPT – self-locking; no thread sealant needed.
4.5 mm Wall Thickness – survives impact from trailer rollers or gravel knock.
Composite Washer Included – NBR outer + Teflon inner; −30 °C to 110 °C, fuel & oil resistant.
Low-Profile Head Ø 50 mm – only 5.2 mm protrusion; keeps plug clear of trailer bunks.
Knurled & Slotted Head – hand-tighten in emergencies, 22 mm spanner for final 1/4 turn.
Lightweight 110 g – 40 % lighter than bronze equivalents—cuts shipping cost.
Usage Scenarios
Garboard / Transom Drain – primary bilge emptying on skiffs, RIBs, sailboats.
Live-Well Drain – flush-mount head avoids snagging nets or lines.
Ice-Chest / Fish-Box Outlet – salt-proof plug for built-in coolers.
Deck Drain Blank – temporary seal for scupper test or winter lay-up.
Why Choose RICHWITS
Factory-Direct – wholesale & retail welcomed, 25 % cost saving vs. bronze equal.
In-Stock – 5 000 pcs ready, MOQ 100 pcs, 48 h dispatch.
Fast Logistics – FedEx/UPS/DHL global 3-7 day delivery.
OEM/ODM – custom thread, shank length or logo within 10 days.
Test Certificates – material mill cert, 48 h salt-spray, torque-seal report supplied free.
FAQ
Q1: Will 316 SS really never rust?
A1: Correct—2-3 % Mo gives lifetime immunity to chlorides; polish yearly to keep the mirror shine.
Q2: What hull thickness will it seal?
A2: Tapered thread + 2 mm washer seals 4–18 mm thick hulls; thicker shanks on request.
Q3: Do I need thread sealant?
A3: Not for NPT taper; PTFE tape optional on aluminium to stop galvanic attack.
Q4: Can I weld the flange after installation?
A4: Yes—316L composition allows TIG field welding; polish heat tint with included restore pad.
Q5: Are spare washers available?
A5: Yes—10-pack of NBR-Teflon washers, MOQ 50 packs, $0.20 each.
Q6: Do you offer test certificates?
A6: Mill certificate for 316 SS, salt-spray report, and torque-seal certificate supplied free on request.
Packing & Delivery
Exihibition
