Watts AquaLock - Large Diameter End Stop

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!important;color:rgba(255,255,255,.65);line-height:1.55;margin:0;} .ro-wrap .faucet-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(200px,100%),1fr));gap:16px;margin-top:4px;} .ro-wrap .faucet-card{border:2px solid var(--slate);border-radius:var(--radius);padding:18px;text-align:center;} .ro-wrap .faucet-icon{font-size:28px !important;margin-bottom:10px;} .ro-wrap .faucet-card h4{font-size:18px !important;font-weight:600;color:var(--deep);margin-bottom:6px;} .ro-wrap .faucet-card p{font-size:15px !important;color:var(--muted);line-height:1.5;margin:0;} .ro-wrap .spec-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(180px,100%),1fr));gap:12px;margin-top:4px;} .ro-wrap .spec-card{background:var(--offwhite);border:1px solid var(--slate);border-radius:var(--radius);padding:16px;} .ro-wrap .spec-card .sc-label{font-size:13px !important;font-weight:700;letter-spacing:.08em;color:var(--sky);text-transform:uppercase;margin-bottom:4px;} .ro-wrap .spec-card .sc-value{font-size:20px !important;font-weight:600;color:var(--deep);margin-bottom:4px;} .ro-wrap .spec-card .sc-note{font-size:15px !important;color:var(--muted);} @media(max-width:640px){ .ro-wrap .ro-hero{padding:36px 24px 32px;} .ro-wrap .ro-section{padding:28px 20px;} .ro-wrap .ro-feature-grid,.ro-wrap .faucet-grid,.ro-wrap .filter-schedule,.ro-wrap .spec-cards{grid-template-columns:1fr;} .ro-wrap .benefits-strip{flex-direction:column;} .ro-wrap .benefit-item{border-right:none;border-bottom:1px solid rgba(255,255,255,.1);} } /* ── Nuclear override — force all text inside ro-wrap to be readable ── */ .ro-wrap p, .ro-wrap li, .ro-wrap td, .ro-wrap th, .ro-wrap .ro-section > p { font-size: 18px !important; line-height: 1.6 !important; } .ro-wrap .ro-section > p, .ro-wrap .ro-callout p, .ro-wrap .stage-body p, .ro-wrap .ro-feature-card p, .ro-wrap .schedule-card p, .ro-wrap .faucet-card p, .ro-wrap .spec-card .sc-note, .ro-wrap .pro-tip p { font-size: 18px !important; line-height: 1.6 !important; } .ro-wrap h2 { font-size: clamp(26px,4vw,40px) !important; line-height:1.15 !important; } .ro-wrap h3 { font-size: 20px !important; line-height:1.3 !important; } .ro-wrap h4 { font-size: 18px !important; line-height:1.3 !important; } .ro-wrap .ro-label, .ro-wrap .stage-tag, .ro-wrap .sc-label { font-size: 14px !important; } .ro-wrap .ro-title { font-size: 24px !important; } .ro-wrap .interval { font-size: 22px !important; } .ro-wrap .stage-num { font-size: 16px !important; } .ro-wrap .ro-eyebrow { font-size: 14px !important; } .ro-wrap .ro-badge { font-size: 15px !important; } The Watts AquaLock Large Diameter End Stop provides a secure, leak-free termination point for push-to-connect tubing in reverse osmosis and water filtration systems. Designed to work with copper, CPVC, PEX, LDPE, MDPE, HDPE, and polypropylene tubing, this fitting delivers reliable performance across residential and commercial applications. SPECIFICATIONS Technical Details Manufacturer Watts Water Technologies Product Line AquaLock Push-to-Connect Fittings Fitting Type End Stop / Cap Connection Method Push-to-connect (no tools required) Compatible Tubing Copper, CPVC, PEX, LDPE, MDPE, HDPE, Polypropylene Diameter Range Large diameter applications (3/4" CTS and above) Material High-grade polymer with stainless steel grip ring Application RO systems, water filtration, plumbing termination INSTALLATION & USE Installation Steps Ensure tubing is cut squarely with a proper tube cutter and deburred on both inside and outside edges Mark insertion depth on tubing (typically 1 inch for large diameter fittings) to verify full seating Push tubing firmly into the AquaLock end stop until it bottoms out against the internal tube stop Tug on the tubing to confirm the stainless steel grip ring has engaged and the connection is secure Pressurize the system slowly and inspect for leaks before putting into full service COMPATIBILITY Tubing Compatibility Chart Watts AquaLock fittings are compatible with a wide range of tubing materials and sizes. For polypropylene tubing, match the outside diameter (OD) to the copper tube size (CTS) equivalent: 3/8" OD to 1/4" CTS, 1/2" OD to 3/8" CTS, 5/8" OD to 1/2" CTS, 7/8" OD to 3/4" CTS, and 1-1/8" OD to 1" CTS. The large diameter end stop is designed for 3/4" CTS and larger applications. AquaLock fittings can also connect to NPT threaded pipe: 1/4" NPT (0.540" OD), 3/8" NPT (0.675" OD), 1/2" NPT (0.840" OD), 3/4" NPT (1.050" OD), 1" NPT (1.315" OD), and larger sizes up to 2" NPT. Always verify your specific tubing outer diameter before selecting the appropriate AquaLock fitting size. 🔧 Pro Tip: When using AquaLock fittings with softer tubing materials like LDPE or polypropylene, use a tube stiffener insert to prevent the tubing from collapsing under the grip ring and to ensure a watertight seal at higher pressures. Show more